unresponsive keypad on ESP32

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Paul French asked 3 years ago

I have a process running where the kepad has become unresponsive. It’s a hit and miss affair depending (I assume) on what part of the loop in running.
I’m using some DS18b20 temp sensors which I think may be causing a delay in the loop while they return the temp values. I read that there is a method where you can sensors.setWaitForConversion(); and use a millis timer, such that the loop is not held up. Maybe this might solve the problem but I don’t know how to correctly implement it as the examples do not operate with fixed hex addresses.
Alternativly, I have read you can attach interrupts to the keypad, which sounds like better solution, but I have not been able to find a detailed tutorial on how to implement this.
Could someone please advise which route would be preferable and suggest an implementation.
Many thanks, Paul

Question Tags: kepad

4 Answers

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Sara Santos Staff answered 3 years ago

Hi Paul.

What’s the current method that you’re using to read the keypad?
Using interrupts seems a good idea. But, I think the main issue might be the time that it takes to get a reading from the sensor. So, I would go first with trying to read the sensor asynchronously.

There is this example in the library:

https://github.com/milesburton/Arduino-Temperature-Control-Library/blob/master/examples/WaitForConversion/WaitForConversion.ino

Instead of getting the temperature by index (sensors.getTempCByIndex(0)), you can get the temperature by address.
For example, imagine this is your address:

DeviceAddress sensor1 = { 0x28, 0xFF, 0x77, 0x62, 0x40, 0x17, 0x4, 0x31 };

Then use the following to get the readings by address:

sensors.getTempC(sensor1);

I hope this helps.
Regards,
Sara

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Paul French answered 3 years ago

Hi Sara,
Thank you for your advice. My code already defines the sensors adresses, however I have not been able to understand or implement the setwaitforconversion examples which use two separate start and stop millis() in a way I have not seen, not including a reset.
Can you provide an example user waitforconversion with set addresses? Here is my code so far:-

uint8_t sensor1[8] = {0x28, 0x2B, 0xFA, 0x75, 0xD0, 0x01, 0x3C, 0xA2};
uint8_t sensor2[8] = { 0x28, 0x1D, 0x33, 0x75, 0xD0, 0x01, 0x3C, 0x2C};
uint8_t sensor3[8] = { 0x28, 0x0C, 0x14, 0x75, 0xD0, 0x01, 0x3C, 0xE9};// REPLACEMENT SENSOR 28 0C 14 75 D0 01 3C E9
unsigned long startTempSensorTimer = 0;
unsigned long stopTempSensorTimer = 0;

void setup()

//Start Temp Sensors DS18B20
sensors.begin();
if(sensors.isParasitePowerMode()) Serial.println(“DS18B20 in Parasitic power mode – ON”);
else Serial.println(“DS18B20 in Parasitic power mode – OFF”);

void loop()

if(millis() – temptimer > 10000)
{
display_handle();
startTempSensorTimer = millis();
sensors.setWaitForConversion(false); // makes it async
sensors.requestTemperatures();
ambientC = sensors.getTempC(sensor1); // Gets the values of the temperature
waterC = sensors.getTempC(sensor2); // Gets the values of the temperature
airoffC = sensors.getTempC(sensor3);
sensors.setWaitForConversion(true);
stopTempSensorTimer = millis();

Serial.println(ambientC);
Serial.println(waterC);
Serial.println(airoffC);
Serial.print(“float switch : “);
Serial.println(floatSwitchStatus);
Serial.print(“Master switch : “);
Serial.println(masterSwitchStatus);
temptimer =millis();
}

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Paul French answered 3 years ago

void setup()

void loop()

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Sara Santos Staff answered 3 years ago

Hi.
I think you just need to call sensors.setWaitForConversion(false); before requesting the temperatures in a “regular” sketch.
I don’t think you need to use that millis(). It is used in the example just to check how long it takes to get readings.
Regards,
Sara