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‎Interfacing PMW3901 Optical Flow Sensor With ESP32/Code/PMW3901_Direction_Indicator/PMW3901_Direction_Indicator.ino

Lines changed: 202 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,202 @@
1+
#include <Wire.h>
2+
#include <Adafruit_GFX.h>
3+
#include <Adafruit_SSD1306.h>
4+
#include <SPI.h>
5+
#include <Bitcraze_PMW3901.h>
6+
7+
// OLED Display setup
8+
#define SCREEN_WIDTH 128
9+
#define SCREEN_HEIGHT 64
10+
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
11+
12+
// PMW3901 Sensor setup
13+
#define CS_PIN 5 // Chip Select Pin for PMW3901
14+
Bitcraze_PMW3901 flow(CS_PIN);
15+
16+
const unsigned char Start_icon [] PROGMEM = {
17+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff,
18+
0x80, 0x00, 0x00, 0x07, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x3f,
19+
0xe0, 0x07, 0xfc, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x01, 0xfc, 0x00, 0x00, 0x3f, 0x80,
20+
0x03, 0xf8, 0x00, 0x00, 0x1f, 0xc0, 0x03, 0xf0, 0x00, 0x00, 0x0f, 0xc0, 0x07, 0xe0, 0x00, 0x00,
21+
0x07, 0xe0, 0x0f, 0xc0, 0x00, 0x00, 0x03, 0xf0, 0x0f, 0x80, 0x38, 0x00, 0x01, 0xf0, 0x1f, 0x00,
22+
0xfc, 0x00, 0x00, 0xf8, 0x1f, 0x01, 0xff, 0x00, 0x00, 0x78, 0x3e, 0x01, 0xff, 0x80, 0x00, 0x7c,
23+
0x3c, 0x01, 0xff, 0xe0, 0x00, 0x3c, 0x3c, 0x01, 0xef, 0xf0, 0x00, 0x3e, 0x7c, 0x01, 0xe3, 0xfc,
24+
0x00, 0x3e, 0x78, 0x01, 0xe1, 0xfe, 0x00, 0x3e, 0x78, 0x01, 0xe0, 0x7f, 0x80, 0x1e, 0x78, 0x01,
25+
0xe0, 0x3f, 0xc0, 0x1e, 0x78, 0x01, 0xe0, 0x0f, 0xc0, 0x1e, 0x78, 0x01, 0xe0, 0x07, 0xc0, 0x1e,
26+
0x78, 0x01, 0xe0, 0x07, 0xc0, 0x1e, 0x78, 0x01, 0xe0, 0x0f, 0xc0, 0x1e, 0x78, 0x01, 0xe0, 0x3f,
27+
0xc0, 0x1e, 0x78, 0x01, 0xe0, 0x7f, 0x80, 0x1e, 0x7c, 0x01, 0xe1, 0xfe, 0x00, 0x3e, 0x7c, 0x01,
28+
0xe3, 0xfc, 0x00, 0x3e, 0x3c, 0x01, 0xef, 0xf0, 0x00, 0x3e, 0x3c, 0x01, 0xff, 0xe0, 0x00, 0x3c,
29+
0x3e, 0x01, 0xff, 0x80, 0x00, 0x7c, 0x1f, 0x01, 0xff, 0x00, 0x00, 0x78, 0x1f, 0x00, 0xfc, 0x00,
30+
0x00, 0xf8, 0x0f, 0x80, 0x30, 0x00, 0x01, 0xf0, 0x0f, 0xc0, 0x00, 0x00, 0x03, 0xf0, 0x07, 0xe0,
31+
0x00, 0x00, 0x07, 0xe0, 0x03, 0xf0, 0x00, 0x00, 0x0f, 0xc0, 0x01, 0xf8, 0x00, 0x00, 0x1f, 0x80,
32+
0x01, 0xfe, 0x00, 0x00, 0x7f, 0x80, 0x00, 0x7f, 0x80, 0x01, 0xfe, 0x00, 0x00, 0x3f, 0xf0, 0x0f,
33+
0xfc, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x07, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x01,
34+
0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
35+
};
36+
37+
const unsigned char LEFT_arrow [] PROGMEM = {
38+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
39+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
40+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00,
41+
0x00, 0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x07, 0xc0, 0x00,
42+
0x00, 0x00, 0x00, 0x0f, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x3f,
43+
0xc0, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xc0, 0x00, 0x00, 0x00, 0x00, 0xff, 0xc0, 0x00, 0x00, 0x00,
44+
0x01, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x03, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff,
45+
0xff, 0xff, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff,
46+
0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
47+
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff,
48+
0xff, 0xff, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0f, 0xff,
49+
0xff, 0xff, 0xff, 0xff, 0x07, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x03, 0xff, 0xc0, 0x00, 0x00, 0x00,
50+
0x01, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xc0, 0x00,
51+
0x00, 0x00, 0x00, 0x3f, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x07,
52+
0xc0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc0, 0x00, 0x00, 0x00,
53+
0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
54+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
55+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
56+
};
57+
58+
const unsigned char UP_arrow [] PROGMEM = {
59+
0x00, 0x00, 0x03, 0x80, 0x00, 0x00, 0x00, 0x00, 0x07, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xe0,
60+
0x00, 0x00, 0x00, 0x00, 0x1f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xf8, 0x00, 0x00, 0x00, 0x00,
61+
0x7f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0x00, 0x00,
62+
0x00, 0x03, 0xff, 0xff, 0x80, 0x00, 0x00, 0x03, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x07, 0xff, 0xff,
63+
0xe0, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x3f,
64+
0xff, 0xff, 0xfc, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
65+
0x01, 0xff, 0xff, 0xff, 0xff, 0x80, 0x03, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x3f, 0xfc,
66+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
67+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00,
68+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
69+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
70+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00,
71+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
72+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
73+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00,
74+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
75+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
76+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00
77+
};
78+
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const unsigned char RIGHT_arrow [] PROGMEM = {
80+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
81+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
82+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00,
83+
0x00, 0x00, 0x00, 0x03, 0x80, 0x00, 0x00, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x03,
84+
0xe0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xfc, 0x00, 0x00, 0x00,
85+
0x00, 0x03, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x03, 0xff, 0x00, 0x00, 0x00, 0x00, 0x03, 0xff, 0x80,
86+
0x00, 0x00, 0x00, 0x03, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x03, 0xff, 0xe0, 0xff, 0xff, 0xff, 0xff,
87+
0xff, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xff, 0xff,
88+
0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
89+
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff,
90+
0xff, 0xfc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xff, 0xff,
91+
0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x03, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x03, 0xff, 0x80,
92+
0x00, 0x00, 0x00, 0x03, 0xff, 0x00, 0x00, 0x00, 0x00, 0x03, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x03,
93+
0xfc, 0x00, 0x00, 0x00, 0x00, 0x03, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x03, 0xf0, 0x00, 0x00, 0x00,
94+
0x00, 0x03, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x03, 0x80, 0x00,
95+
0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
96+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
97+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
98+
};
99+
100+
const unsigned char DOWN_arrow [] PROGMEM = {
101+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
102+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
103+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00,
104+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
105+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
106+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00,
107+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
108+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
109+
0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00,
110+
0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc,
111+
0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfc, 0x00, 0x00, 0x00, 0x00,
112+
0x3f, 0xfc, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x01, 0xff, 0xff, 0xff, 0xff, 0x80,
113+
0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x3f, 0xff, 0xff,
114+
0xfc, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x07,
115+
0xff, 0xff, 0xe0, 0x00, 0x00, 0x03, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x01, 0xff, 0xff, 0x80, 0x00,
116+
0x00, 0x00, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x7f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xfe,
117+
0x00, 0x00, 0x00, 0x00, 0x1f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00,
118+
0x07, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc0, 0x00, 0x00
119+
};
120+
121+
122+
123+
// Arrow width & height
124+
#define ARROW_WIDTH 48
125+
#define ARROW_HEIGHT 48
126+
127+
// Store last movement direction
128+
String lastMovement = "No Movement";
129+
const unsigned char* lastArrow = nullptr;
130+
131+
void updateDisplay() {
132+
display.clearDisplay();
133+
// Center the arrow
134+
int x = (SCREEN_WIDTH - ARROW_WIDTH) / 2;
135+
int y = (SCREEN_HEIGHT - ARROW_HEIGHT) / 2;
136+
137+
if (lastArrow) {
138+
display.drawBitmap(40, 8, lastArrow, ARROW_WIDTH, ARROW_HEIGHT, WHITE);
139+
}
140+
display.display();
141+
}
142+
143+
void setup() {
144+
Serial.begin(115200);
145+
146+
// Initialize OLED
147+
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
148+
Serial.println("SSD1306 allocation failed");
149+
while (1);
150+
}
151+
152+
// Initialize PMW3901
153+
SPI.begin();
154+
if (!flow.begin()) {
155+
Serial.println("PMW3901 Initialization failed!");
156+
display.clearDisplay();
157+
display.setTextColor(WHITE);
158+
display.setCursor(10, 25);
159+
display.println("Sensor Fail!");
160+
display.display();
161+
while (1);
162+
}
163+
164+
Serial.println("PMW3901 Initialized");
165+
display.clearDisplay();
166+
lastArrow = Start_icon;
167+
updateDisplay();
168+
}
169+
170+
void loop() {
171+
int16_t deltaX = 0, deltaY = 0;
172+
173+
// Read motion data
174+
flow.readMotionCount(&deltaX, &deltaY); // Directly updates deltaX & deltaY
175+
176+
Serial.print("DX: "); Serial.print(deltaX);
177+
Serial.print(" DY: "); Serial.println(deltaY);
178+
179+
// Ignore small movements
180+
if (abs(deltaX) < 3 && abs(deltaY) < 3) {
181+
return; // Do not update display if no new movement
182+
}
183+
184+
// Detect only Up, Down, Left, Right
185+
if (deltaX > 3 && abs(deltaY) < 3) {
186+
lastMovement = "Right";
187+
lastArrow = RIGHT_arrow;
188+
} else if (deltaX < -3 && abs(deltaY) < 3) {
189+
lastMovement = "Left";
190+
lastArrow = LEFT_arrow;
191+
} else if (deltaY > 3 && abs(deltaX) < 3) {
192+
lastMovement = "UP";
193+
lastArrow = UP_arrow;
194+
} else if (deltaY < -3 && abs(deltaX) < 3) {
195+
lastMovement = "Down";
196+
lastArrow = DOWN_arrow;
197+
} else {
198+
return; // Ignore diagonal movements
199+
}
200+
201+
updateDisplay(); // Update OLED only when movement occurs
202+
}

‎Interfacing PMW3901 Optical Flow Sensor With ESP32/Code/PMW3901_Framebuffer/PMW3901_Framebuffer.ino

Lines changed: 143 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,143 @@
1+
#include <SPI.h>
2+
#include <Bitcraze_PMW3901.h>
3+
#include <WiFi.h>
4+
#include <ESPAsyncWebServer.h>
5+
6+
// WiFi credentials
7+
const char* ssid = "SSID";
8+
const char* password = "PASSWORD";
9+
10+
// PMW3901 (CS pin on GPIO 5)
11+
Bitcraze_PMW3901 flow(5);
12+
13+
// Web server on port 80
14+
AsyncWebServer server(80);
15+
16+
// Frame buffer (35x35 = 1225 bytes)
17+
char frame[35 * 35];
18+
19+
void setup() {
20+
Serial.begin(115200);
21+
22+
// Initialize PMW3901
23+
if (!flow.begin()) {
24+
Serial.println("PMW3901 init failed");
25+
while (1); // halt
26+
}
27+
28+
flow.enableFrameBuffer();
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Serial.println("PMW3901 frame buffer enabled");
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// Connect to Wi-Fi
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WiFi.begin(ssid, password);
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WiFi.setSleep(false); // improves performance
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while (WiFi.status() != WL_CONNECTED) {
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delay(1000);
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Serial.println("Connecting to WiFi...");
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}
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Serial.print("Connected. IP address: ");
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Serial.println(WiFi.localIP());
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// Serve HTML UI
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server.on("/", HTTP_GET, [](AsyncWebServerRequest* request) {
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String html = R"rawliteral(
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<!DOCTYPE html>
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<html>
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<head>
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<title>PMW3901 Frame Buffer</title>
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<style>
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canvas {
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display: block;
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margin: auto;
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image-rendering: pixelated;
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width: 350px;
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height: 350px;
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border: 1px solid black;
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}
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body {
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font-family: sans-serif;
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background: #111;
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color: #fff;
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text-align: center;
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}
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#fps {
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margin: 10px;
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font-size: 1.2em;
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}
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</style>
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</head>
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<body>
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<h1>PMW3901 Frame Buffer</h1>
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<div id="fps">FPS: 0</div>
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<canvas id="frameBuffer" width="35" height="35"></canvas>
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<script>
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const canvas = document.getElementById('frameBuffer');
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const ctx = canvas.getContext('2d');
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const imageData = ctx.createImageData(35, 35);
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// Ironhot pseudo-color palette (33 entries)
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const ironhot = [
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[0, 0, 0], [35, 0, 0], [64, 0, 0], [96, 0, 0], [128, 0, 0], [160, 0, 0],
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[192, 0, 0], [224, 0, 0], [255, 0, 0], [255, 32, 0], [255, 64, 0],
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[255, 96, 0], [255, 128, 0], [255, 160, 0], [255, 192, 0], [255, 224, 0],
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[255, 255, 0], [224, 255, 32], [192, 255, 64], [160, 255, 96],
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[128, 255, 128], [96, 255, 160], [64, 255, 192], [32, 255, 224],
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[0, 255, 255], [0, 224, 255], [0, 192, 255], [0, 160, 255],
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[0, 128, 255], [0, 96, 255], [0, 64, 255], [0, 32, 255], [0, 0, 255]
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];
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let lastTime = performance.now();
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async function fetchFrameBuffer() {
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try {
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const response = await fetch('/data');
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const buffer = await response.arrayBuffer();
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const data = new Uint8Array(buffer);
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for (let i = 0; i < data.length; i++) {
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const val = data[i];
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const colorIndex = Math.floor((val / 255) * (ironhot.length - 1));
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const [r, g, b] = ironhot[colorIndex];
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const index = i * 4;
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imageData.data[index] = r;
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imageData.data[index + 1] = g;
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imageData.data[index + 2] = b;
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imageData.data[index + 3] = 255;
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}
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ctx.putImageData(imageData, 0, 0);
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const now = performance.now();
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const fps = (1000 / (now - lastTime)).toFixed(1);
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lastTime = now;
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document.getElementById('fps').innerText = `FPS: ${fps}`;
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requestAnimationFrame(fetchFrameBuffer);
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} catch (err) {
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console.error("Fetch error:", err);
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setTimeout(fetchFrameBuffer, 100);
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}
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}
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fetchFrameBuffer();
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</script>
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</body>
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</html>
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)rawliteral";
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request->send(200, "text/html", html);
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});
131+
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// Binary data response
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server.on("/data", HTTP_GET, [](AsyncWebServerRequest* request) {
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flow.readFrameBuffer(frame);
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request->send_P(200, "application/octet-stream", (uint8_t*)frame, sizeof(frame));
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});
137+
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server.begin();
139+
}
140+
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void loop() {
142+
// Nothing here
143+
}

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