Hi,
I am using ESP-01 (1MB) with the ESP-01S relay module. I have tweaked the module by connecting VCC with CHPD through 10K, remove R2 from the board, and pullup GPIO0 with 10K.
When I program ESP-01 with the programmer it's working fine. but When I connect it with Relay Module, It shows it as standalone. When I fill UID/PASS then again it shows up as standalone. sometimes it connected with my wifi network but not shown IP and its name.
I connected a switch as an Input with serial
in setup its like this
#define in_led 0
#define btnPin 3
void setup() {
pinMode(in_led, OUTPUT);
digitalWrite(in_led, LOW);
pinMode(btnPin, INPUT);
attachInterrupt(digitalPinToInterrupt(btnPin), checkButton, CHANGE);
Serial.begin (115200,SERIAL_8N1,SERIAL_TX_ONLY);
if(!wifiManager.autoConnect("MY_DEV")){
Serial.println("failed to connect, we should reset as see if it connects");
}
}
Interestingly code in interrupt works, but not the other piece of code. it only shows as a standalone device.
Any idea what is going wrong?
These are nice modules but there are a lot of restrictions that must be adhered to.
I copied this from: ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials.
The pins highlighted in green are OK to use. The ones highlighted in yellow are OK to use, but you need to pay attention because they may have unexpected behavior mainly at boot. The pins highlighted in red are not recommended to use as inputs or outputs.
Label
GPIO
Input
Output
Notes
D0
GPIO16
no interrupt
no PWM or I2C support
HIGH at boot used to wake up from deep sleep
D1
GPIO5
OK
OK
often used as SCL (I2C)
D2
GPIO4
OK
OK
often used as SDA (I2C)
D3
GPIO0
pulled up
OK
connected to FLASH button, boot fails if pulled LOW
D4
GPIO2
pulled up
OK
HIGH at boot connected to on-board LED, boot fails if pulled LOW
D5
GPIO14
OK
OK
SPI (SCLK)
D6
GPIO12
OK
OK
SPI (MISO)
D7
GPIO13
OK
OK
SPI (MOSI)
D8
GPIO15
pulled to GND
OK
SPI (CS) Boot fails if pulled HIGH
RX
GPIO3
OK
RX pin
HIGH at boot
TX
GPIO1
TX pin
OK
HIGH at boot debug output at boot, boot fails if pulled LOW
Yes, I already read this. but I think that the main issue is with the RX pin when it's connected to the load (touch switch).
It boots fine and working fine till its connected to FTDI Power, once connected with the relay module , its stop working
Uptil now I did the following
CH_PD = use Jumper to 3.3V, then later use 10K resistor
GPIO 0 = PULL UP with 10K.
Also, swap relay module R1 with R2. but nothing seems working
So which GPIO pin are you using for the ESP-01S relay module ?
If the schematic here is correct for your module, ESP8266 ESP-01S Relay Modul – STEINHORST.ORG , the relay module has a 10k pull down resistor which may cause problems if the pin needs to be high at boot time.
