Arduino Uno Shield for Blue Light Optical Sensor. The circuit generates a 2.1kHz sinusoidal signal to send to LEDs and contains a filtering and amplification circuit to preprocess the signal. Powered by 24V and regulated down to 12V and 5V to power Arduino. #ArduinoUno

Arduino Digital IR Sensor Integration with Schmitt-Trigger Conditioning

ATmega4809 series Transceiver; 802.11 b/g/n (WiFi, WLAN) 5V 16MHz