No.My first question is: Does all digital pins support open drain?
It's all in the datasheet described.
Search found 18 matches
- Fri Nov 08, 2019 3:38 pm
- Forum: ESP32 Arduino
- Topic: open drain output
- Replies: 4
- Views: 23651
Re: open drain output
It's all in the datasheet described.
- Fri Nov 08, 2019 3:36 pm
- Forum: ESP32 Arduino
- Topic: Wire two Dallas ds18b20
- Replies: 5
- Views: 11363
Re: Wire two Dallas ds18b20
You have to en bale the parasit power mode for the ds18b20 in Arduino.
- Thu Oct 24, 2019 7:48 pm
- Forum: ESP32 Arduino
- Topic: ESP32 RS485driver hardwareserial ModbusMaster
- Replies: 23
- Views: 53257
Re: ESP32 RS485driver hardwareserial ModbusMaster
Modbusmaster works fine with RS485 on a Esp32.
Have a look for the tip and tricks: http://evertdekker.com/?p=1307
You have to set the fucntions preTransmission() and postTransmission() correct, see the above sample
Have a look for the tip and tricks: http://evertdekker.com/?p=1307
You have to set the fucntions preTransmission() and postTransmission() correct, see the above sample
- Thu Oct 24, 2019 7:42 pm
- Forum: ESP32 Arduino
- Topic: [SOLVED]Receiving no data from Serial2
- Replies: 7
- Views: 19599
Re: Receiving no data from Serial2
Isn't it that RXD2 gpio 16 and TXD2 gpio17?
- Fri Mar 15, 2019 9:49 pm
- Forum: ESP32 Arduino
- Topic: esp32 does not read analogue values
- Replies: 6
- Views: 29252
Re: esp32 does not read analogue values
Don't set your ADC channel as input
Code: Select all
pinMode(sensor, INPUT);- Thu Mar 07, 2019 9:15 am
- Forum: ESP32 Arduino
- Topic: Wire doesn't work with ESP32 / 8266
- Replies: 6
- Views: 10073
Re: Wire doesn't work with ESP32 / 8266
2N7000 is not suitable for level shifting. The required gate voltage is to high.
https://forum.arduino.cc/index.php?topic=564390.15
https://forum.arduino.cc/index.php?topic=564390.15
- Fri Mar 01, 2019 10:28 pm
- Forum: ESP32 Arduino
- Topic: Payload issue
- Replies: 3
- Views: 8013
Re: Payload issue
Payload is a pointer to the payload, by using the variable again will be overwritten try something like this.
char *mypayload = payload;
if (strcmp(topic, Blinds_Topic) == 0) {
setRelay(payload);
mqttClient.publish(Blinds_Feedback_Topic, 1, false, mypayload);
Serial.println("Publishing ...
char *mypayload = payload;
if (strcmp(topic, Blinds_Topic) == 0) {
setRelay(payload);
mqttClient.publish(Blinds_Feedback_Topic, 1, false, mypayload);
Serial.println("Publishing ...
- Sun Feb 17, 2019 3:26 pm
- Forum: ESP32 Arduino
- Topic: How do I set CPU speed of NODEMCU ESP32-S to 240MHz in Arduino IDE?
- Replies: 2
- Views: 28670
Re: How do I set CPU speed of NODEMCU ESP32-S to 240MHz in Arduino IDE?
Cpu clock is fixed to 240Mhz in the Arduino ide.
- Wed Jan 30, 2019 6:53 pm
- Forum: ESP32 Arduino
- Topic: Heltec wifi kit32, hardware serial
- Replies: 4
- Views: 10644
Re: Heltec wifi kit32, hardware serial
This works fine for me:
Code: Select all
HardwareSerial Pzemserial(2);
#define RXD2 16 //Gpio pins Serial2
#define TXD2 17
Pzemserial.begin(9600, SERIAL_8N1, RXD2, TXD2);- Thu Jan 24, 2019 10:44 pm
- Forum: ESP32 Arduino
- Topic: ESP32 interfaced with currnet sensor acs712 on rtos platform
- Replies: 2
- Views: 6288
Re: ESP32 interfaced with currnet sensor acs712 on rtos platform
Keep in mind that the asc712 works on 5V and the Esp32 on 3.3V
So if you feeding the sensor with 5V you have to reduce the output to the 3.3V scale with a voltage divider.
What current are you measuring AC, DC?
If you want to measure energy consumption please have a look at my blog for the Pzem-016 ...
So if you feeding the sensor with 5V you have to reduce the output to the 3.3V scale with a voltage divider.
What current are you measuring AC, DC?
If you want to measure energy consumption please have a look at my blog for the Pzem-016 ...