Content

ESP32

ESP8266

Raspberry

Arduino

Attiny

Other

Soil Moisture sensors: Problems & solutions
I2C Address conflicts
Using a MAX6675 temperature sensor without library
MX1508 vs L9110s vs L293D motordriver board
LSC-smart sensors switches and lamps
Getting I2C regulated 0-10 volt out of an arduino or ESP8266
Using limitswitches with diodes
Is the SI1145 reliable or is it a piece of crap
mini WiF RGB/RGBW LEDstrip controller Magichome Arilux AL LC0x
dimming-an-ac-lamp-via-mqtt
IFTTT Webhooks on Arduino
MQTT for beginners
reverse-polarity-protection-with a P-MOSFET
switching-a-humidity-sensor-off-and-on
JSON MQTT and OpenHAB
The LM335 and its seriesresistor
The W5100-bug
Adding an MCP23017 16-port io expander to arduino or esp8266
A Capacitive soil moisture sensor: Part-4
Calculating Sunrise and Sunset on Arduino or other microcontroller

Switching low voltage AC with a microcontroller

Versatile microcontroller PSU
RTC with EEPROM
Cheap PIR hack
PowerLED drivers
A Tachometer
Opamp to irrigate your Garden (newer, better)
OpAmp to irrigate your Garden
Using MOSFETs with TTL levels (5 volt and3V3)
3-Wire LCD
Identifying LCD modules

Relays

A cheap 1-channel relaymodule for ESP8266-01: modifications revisited
Adding a popular 5volt 4-channel relay board to a 3V3 processor: beginners
The 16 channel relay module and the raspberry: Not an ideal marriage
How to use a popular 1 channel Webstore relay on 3V3 / Re-inverting an inverting relay
Simple WiFi relay board (3)
Simple WiFi relay board or DIY Sonoff SV Sonoff 4-channel (2)
Simple WiFi relay board or DIY Sonoff SV Sonoff 4-channel (1)

Single channel AC TRIAC Switch
4 channel Solid Staterelay for microcontroller