Connect DS18B20 to Grove Port A?

Reply to Connect DS18B20 to Grove Port A? on Wed, 23 Jun 2021 14:38:52 GMT

grelm — Wed, 23 Jun 2021 14:38:52 GMT

I am happy to read that the post was helpful.
Which changes did you apply to make it work?

Reply to Connect DS18B20 to Grove Port A? on Wed, 23 Jun 2021 13:56:27 GMT

critter — Wed, 23 Jun 2021 13:56:27 GMT

All right, to answer my own post :
This post helped a lot :
https://community.m5stack.com/topic/1086/problem-when-connecting-more-than-3-ds18b20-temperature-sensors-solved/6

And XX is 21.

Reply to Connect DS18B20 to Grove Port A? on Wed, 23 Jun 2021 11:55:37 GMT

critter — Wed, 23 Jun 2021 11:55:37 GMT

I've connected a DS1820 waterproof sensor to the Grove / Port A of the M5basic

GND=black
VCC=red
SDA=yellow

My code is :

#include
#include
#include

#define ONE_WIRE_BUS XX
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup(){

M5.begin();
M5.Power.begin();

M5.Lcd.print("onewire temp test");
}

void loop() {
sensors.requestTemperatures();
String text = String(sensors.getTempCByIndex(0),2)+"C";
M5.Lcd.println(text);
delay(800);
M5.Lcd.println("test");
}

for XX, I've tried port 21,22,32,33 and a few other I read rumours about. No success to read the temperature so far. Any clue?

Reply to Connect DS18B20 to Grove Port A? on Mon, 17 May 2021 18:00:54 GMT

robalstona — Mon, 17 May 2021 18:00:54 GMT

I made custom block for uiflow for do this. But i implemented use only one sensor per gpio pin without checking crc errors (shorter and simplicity code).

https://github.com/stonatm/UiFlow-custom-blocks/tree/master/ds18b20

and here is python code used in this custom block:

https://github.com/stonatm/M5Atom_matrix_library/blob/master/lib/dallas.py

Try connect sensor to SDA pin in groove port, but you must find a number of gpio pin assigned for this line.
You also should connect a pullup resistor (2-10kohm) betwen sensor DQ pin and sensor Vcc. In my case i use ds18b20 without this resistor, but my connection to sensor is shorter than 10cm.