Questions tagged [nodemcu]
For questions about NodeMCU, an open source IoT platform which includes firmware for running on the ESP8266.
563 questions
-1 votes
1 answer
70 views
Urgent help/advice needed for a fish autofeeding device using NodeMCU
I have been assigned to set up these fish autofeeders that have been assembled . The goal is to have the autofeeders installed on top of the fish tank and dispensing food at chosen times (so somehow ...
1 vote
1 answer
158 views
NodeMCU 1.0 - Port D3, relay and pump does not boot
I'm trying to create a watering system using a NodeMCU 1.0, a relay and some pumps. Currently I've port D0, D1, D2, D5, D6, D7, D8 already in use. I'm trying to use the port D3 (GPIO0) as follows, but ...
- 195
1 vote
1 answer
183 views
SdFat.h pin selection ESP8266
This super simple code, that saves data to a csv file, works perfectly fine on my Arduino Uno (I am using the default SPI pins). However, for my project I need to use an ESP8266. Does the library ...
- 29
0 votes
1 answer
70 views
Updating multiple Arduino Nanos with same INO file
BTW - I have, unsuccessfully, searched for an answer before posting. I have an NodeMCU connected to a bunch of Arduino Nanos over the I2C bus. The WiFi-enabled NodeMCU has the capability to do OTA ...
- 9
0 votes
1 answer
132 views
Can Vin of ESP handle many voltage sensors and relays?
My project is Charging Battery via Solar and Piezoelectric sensor while also getting the Realtime Voltage of the Battery, Capacitor, and Solar. I want to use Vin as the source to get 5V because ...
- 1
2 votes
1 answer
306 views
OLED and Wifi not working together on ESP8266 Heltec NodeMCU
I have this ESP8266 Heltec NodeMCU board with OLED. The pins are described here. I have the following problem. The both OLED (with u8g2) and Wifi work fine individually. There is a problem getting ...
- 171
2 votes
2 answers
404 views
Can I use SPI-related pins as a Digital Output?
I am trying to use an esp32 (NodeMCU-32s) as a ringlight controller for my camera. All it should do is sense when an input pin goes low (the camera's output connects to ground when the shutter goes ...
- 21
3 votes
1 answer
388 views
NodeMCU V3 GOT OVERHEATED AND DIED
My NodeMCU V3 got overheated and died. Please help me figure out what i did wrong. Brief Desrip: Project is an RC Car on ESPNOW Protocol. Transmitter setup have an Arduino Nano to take values from Two ...
-1 votes
1 answer
450 views
NodeMcu V3 & BMe280 -> Temperature, Humidity, Pressure: value nan
I've just started playing around with a NodeMcu V3 and a BME280 sensor. wiring VCC -> 3.3V GND -> GND SCL -> D1 (GPIO5) SDA -> D2 (GPIO4) I've tried this sketch / I2C scanner: it finds ...
0 votes
1 answer
471 views
LED doesn't completely turn off with digitalWrite(led, LOW);
When I was testing out a program I found a strange behavior of ESP8266. LEDs don't turn off completely in the first digitalWrite(led, LOW), just the brightness of the LED goes down, but it does turn ...
- 73
0 votes
1 answer
353 views
ESP8266 serial monitor spitting out garbage
I am trying to set up a weather station, and I should just have the anemometer left. This code works fine (as far as I know). // Pin definitions const int reedSwitchPin = 2; // Variables volatile ...
- 91
2 votes
1 answer
522 views
ESP8266 seems to be killing a while loop
When i was testing out a program I found a strange behavior of esp8266 It seems to get out of a while loop even when there's no option of getting out on code I don't know if these are related but here'...
- 73
0 votes
1 answer
102 views
NodeMCU code that both display OLED and control WS2812 LED Ring
I'm trying to make a project using NodeMCU that show pictures in small OLED screen and also controlling WS2812 LED Ring. I manage to do each of them separately but I'm not sure how to mix them ...
- 149
1 vote
1 answer
199 views
Powering a NodeMCU as well as a GSM module
I'm trying to connect a GSM module(sim800L) with a NodeMCU to execute remote operations. But the GSM module cannot be powered using the NodeMCU. So, what are the other ways to power the board as well ...
- 91
1 vote
0 answers
415 views
ESP8266 + NodeMCU Motor Shield spinning motor only in one direction
I hooked my ESP8266 Wi-Fi module to an ESP-12E Motor Shield and connected it to an RC car. It works fine when connected to my laptop (Goes forward, backward, left, and right. Though the car doesn't ...
- 21