I am using a Distance Sensor GP2Y0A51SK0F
I connected it directly to Arduino Pro Mini 5V:
red to vcc 5v
black to ground
white to A0
no resistors or other hardware.
When going to sleep it still takes about 15 ma.
I need help to understand if I can make the sensor sleep from code or do I need to add a resistor to make it the power consumption way lower.
void setup() {
Serial.begin(115200);
}
// Maximum value of times_read_average:64 (2^16/1024)
unsigned int times_read_average = 32;
unsigned int sensorA_v = 0;
int sensor_diff = 0;
unsigned int sensorAB_distance = 10; //cm
// 2~15cm
// 2 3 4 5 6 7 8 9 10 11 12 13 14 15
float table_voltage[] = {2.08,1.68,1.32,1.06,0.91,0.81,0.72,0.66,0.59,0.52,0.48,0.45,0.43,0.39};
typedef struct {
float offset; //cm
float distance; //cm,
unsigned int adc;
float voltage; //v
int pin;
}SHARP;
SHARP sensorA = {0,0,0,0,A0};
void loop() {
for(int i=1;i<=times_read_average;i++){
sensorA.adc = (sensorA.adc*(times_read_average-1) + analogRead(sensorA.pin))/times_read_average;
}
sensorA.voltage = sensorA.adc * (5.0 / 1023.0);
for(int i=0;i<14;i++){
if(sensorA.voltage<= table_voltage[i]){
sensorA.distance =i+2;
}
}
Serial.print("R: ");
Serial.print(sensorA.adc);
Serial.print(" , ");
Serial.print(sensorA.voltage);
Serial.print("v, | ");
Serial.print(sensorA.distance);
Serial.println("cm");
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); // 8s is max for low.power lib, but with a 65 loops = 10mins
}
Thanks!
Also, take into consideration that, for the UNO, there is an overall ABSOLUTE MAXIMUM current limit of 200mA.
