Page 11 of 16
Page 224
void setup() {
Serial.begin(9600);
}
void loop() {
pinMode(2, OUTPUT);
digitalWrite(2, 1);
delay(1000);
digitalWrite(2, 0);
delay(1);
pinMode(2, INPUT);
while (digitalRead(2) == 1) {};
while (digitalRead(2) == 0) {};
while (digitalRead(2) == 1) {};
int64_t t2;
uint32_t data = 0;
int64_t t1 = micros();
for (int i = 0; i < 32; i++) {
while (digitalRead(2) == 0) {
};
while (digitalRead(2) == 1) {
};
t2 = micros();
data = data << 1;
data = data | ((t2 - t1) > 100);
t1 = t2;
}
uint8_t checksum = 0;
for (int i = 0; i < 8; i++) {
while (digitalRead(2) == 0) {};
while (digitalRead(2) == 1) {};
t2 = micros();
checksum = checksum << 1;
checksum = checksum | ((t2 - t1) > 100);
t1 = t2;
}
Serial.printf("data %ld\n", data);
uint8_t byte1 = (data >> 24 & 0xFF);
uint8_t byte2 = (data >> 16 & 0xFF);
uint8_t byte3 = (data >> 8 & 0xFF);
uint8_t byte4 = (data & 0xFF);
Serial.printf("Checksum %X %X\n", checksum,
(byte1 + byte2 + byte3 + byte4) & 0xFF);
float humidity = (float)((byte1 << 8) | byte2) / 10.0;
Serial.printf("Humidity= %f %%\n", humidity);
float temperature;
int neg = byte3 & 0x80;
byte3 = byte3 & 0x7F;
temperature = (float)(byte3 << 8 | byte4) / 10.0;
if (neg > 0)
temperature = -temperature;
Serial.printf("Temperature= %f C\n", temperature);
delay(1000);
}
Page 225
void setup() {
Serial.begin(9600);
}
void loop() {
pinMode(2, OUTPUT);
digitalWrite(2, 1);
delay(1000);
digitalWrite(2, 0);
delay(1);
pinMode(2, INPUT);
while (digitalRead(2) == 1) {};
while (digitalRead(2) == 0) {};
while (digitalRead(2) == 1) {};
uint32_t data = 0;
for (int i = 0; i < 32; i++)
{
while (digitalRead(2) == 0) {};
delayMicroseconds(50);
data = data << 1;
data = data | digitalRead(2);
while (digitalRead(2) == 1) {};
}
uint8_t checksum = 0;
for (int i = 0; i < 8; i++)
{
while (digitalRead(2) == 0) {};
delayMicroseconds(50);
checksum = checksum << 1;
checksum = checksum | digitalRead(2);
while (digitalRead(2) == 1) {};
}
Serial.printf("data %ld\n", data);
uint8_t byte1 = (data >> 24 & 0xFF);
uint8_t byte2 = (data >> 16 & 0xFF);
uint8_t byte3 = (data >> 8 & 0xFF);
uint8_t byte4 = (data & 0xFF);
Serial.printf("Checksum %X %X\n", checksum,
(byte1 + byte2 + byte3 + byte4) & 0xFF);
float humidity = (float)((byte1 << 8) | byte2) / 10.0;
Serial.printf("Humidity= %f %%\n", humidity);
float temperature;
int neg = byte3 & 0x80;
byte3 = byte3 & 0x7F;
temperature = (float)(byte3 << 8 | byte4) / 10.0;
if (neg > 0)
temperature = -temperature;
Serial.printf("Temperature= %f C\n", temperature);
delay(1000);
}
Page 240
uint8_t readBit(uint8_t pin) {
digitalWrite(pin, 0);
delayMicroseconds(2);
digitalWrite(pin, 1);
delayMicroseconds(5);
uint8_t b = digitalRead(pin);
delayMicroseconds(60);
return b;
}
void writeBit(uint8_t pin, int b) {
int delay1, delay2;
if (b == 1) {
delay1 = 6;
delay2 = 64;
} else {
delay1 = 60;
delay2 = 10;
}
digitalWrite(pin, 0);
delayMicroseconds(delay1);
digitalWrite(pin, 1);
delayMicroseconds(delay2);
}
int readByte(uint8_t pin) {
int byte = 0;
for (int i = 0; i < 8; i++) {
byte = byte | readBit(pin) << i;
};
return byte;
}
void writeByte(uint8_t pin, int byte) {
for (int i = 0; i < 8; i++) {
if (byte & 1) {
writeBit(pin, 1);
} else {
writeBit(pin, 0);
}
byte = byte >> 1;
}
}
int presence(int pin) {
pinMode(pin, OUTPUT |OPEN_DRAIN);
digitalWrite(pin, 1);
delayMicroseconds(1000);
digitalWrite(pin, 0);
delayMicroseconds(480);
digitalWrite(pin, 1);
delayMicroseconds(70);
int res = digitalRead(pin);
delayMicroseconds(410);
return res;
}
int convert(uint8_t pin) {
writeByte(pin, 0x44);
int i;
for (i = 0; i < 500; i++) {
delayMicroseconds(10000);
if (digitalRead(pin) == 1)
break;
}
return i;
}
uint8_t crc8(uint8_t* data, uint8_t len) {
uint8_t temp;
uint8_t databyte;
uint8_t crc = 0;
for (int i = 0; i < len; i++) {
databyte = data[i];
for (int j = 0; j < 8; j++) {
temp = (crc ^ databyte) & 0x01;
crc >>= 1;
if (temp)
crc ^= 0x8C;
databyte >>= 1;
}
}
return crc;
}
float getTemperature(uint8_t pin) {
if (presence(pin) == 1) return -1000;
writeByte(pin, 0xCC);
if (convert(pin) == 500) return -3000;
presence(pin);
writeByte(pin, 0xCC);
writeByte(pin, 0xBE);
uint8_t data[9];
for (int i = 0; i < 9; i++) {
data[i] = readByte(pin);
}
uint8_t crc = crc8(data, 9);
if (crc != 0) return -2000;
int t1 = data[0];
int t2 = data[1];
int16_t temp1 = (t2 << 8 | t1);
float temp = (float)temp1 / 16;
return temp;
}
void setup() {
Serial.begin(9600);
}
void loop() {
float temp = getTemperature(2);
Serial.printf("temperature=%f\n", temp);
delay(1000);
}
Page 318 ESP32 S3
void convertGRB(int GRB, rmt_data_t *rawdata) {
int mask = 0x800000;
for (int j = 0; j < 24; j++) {
if ((GRB & mask)) {
rawdata[j].level0 = 1;
rawdata[j].duration0 = 7;
rawdata[j].level1 = 0;
rawdata[j].duration1 = 12 - 7;
} else {
rawdata[j].level0 = 1;
rawdata[j].duration0 = 3;
rawdata[j].level1 = 0;
rawdata[j].duration1 = 12 - 3;
}
mask = mask >> 1;
}
}
rmt_data_t raw_symbols[100];
int pin = 48;
void setup() {
Serial.begin(9600);
rmtInit(pin, RMT_TX_MODE, RMT_MEM_NUM_BLOCKS_1, 10000000);
}
void loop() {
int color = 0x00FFFF;
convertGRB(color, raw_symbols);
rmtWrite(pin, raw_symbols,
24 * sizeof(rmt_data_t), RMT_WAIT_FOR_EVER);
delay(1000);
}
