3units! 2 Channel DC 5V Relay Switch Board Module, for Arduino Rberry Pi PIC ARM Sensors This model is an upgrade

This model is an upgrade from the lower precision HC-SR04

5V Relay Module with Optocoupler Low Level Trigger Expansion Board for Arduino – 2 channels

3 in diagonal LED backlit HD+ SVA anti-glare (1600 x 900)

USBASP USBISP AVR Programmer Adapter 10 Pin Cable USB ATMEGA8 ATMEGA128

the ESP8266-D1 will appear as a standard serial COM port

3units! 2 Channel DC 5V Relay Switch Board Module, for Arduino Rberry Pi PIC ARM Sensors This model is an upgrade3 units! 5V Relay Module with Optocoupler Low Level Trigger Expansion Board for Arduino 2 channels These relays work great, genuine work horses, with SMD optocoupler isolation, and very stable performance. It can be used as a microcontroller development board module, or as home appliance control. Normally open interface and can be set to high or low triggered by jumper. Maximum load: AC 250V 10A, DC 30V 10A. Trigger current: 5mA Fail safe design, even