Larger 4 digit Serial 7 Segment display which has capability of communicating through SPI / I2C / serial TTL inputs. Smaller version is basic display board with 0.56" display and LEDs for colon and Apos. Larger board is based on same basic design but it adds ports for DS1307/DS3132 RTC boards, ESP8266-01 or 12E/F, DHT11/22 enviromental sensor, LDR light sensor and extra status LED's. Unused pins f...
This is a ethernet relqay board with 2 relay, 2 inputs for 240 AC detector, 2 LEDs and 2 switch you can program many options; that consist:
Atmega 328p CPU
ENC28j60 red or blue board
CP2102 white board to program the CPU or similar
AVR STK500 or similar to copy the reiquared firmware to bootload:
A dual microcontroller board for controlling "Neopixel" LEDs, with one micro dedicated to driving the LEDs while the other micro is busy reading push buttons, polling rotary encoders, reading IR remote signals etc etc.
The microcontrollers -two atmega328s -communicate with one another over their I2C bus. The very short wire run negates the need for the usual pull up resistors on the bus.