ESP8266 keychain is a swiss army knife for electronics makers
Designed by S-March, dEEbugger is a multifunctional ESP8266-based keychain that could serve as a swiss army knife to electronics lovers. Powered via an USB port, it operates over a web browser interface and features several functions including oscilloscope with real-time peak detection, I2C and UART terminals.
Multifunctional ESP8266 keychain