Quantity   Component name
2 × ESP8266 ESP-12 modules
2 × ESP-12 breakout board
2 × MCP4725 breakout board
2 × PAM8403 Amplifier board
1 × PT8211/TM8211 i2s DAC (replaced MCP4725 in v1)
1 × 8002 audio amplifier (replaced PAM8403 in v1)
2 × MCP3021 or TLC549 ADC Data Converters / Analog to Digital Converter ICs (ADCs)
1 × 3.3V DC-DC step-down power supply module
1 × DC motor driver
1 × ATTiny85 board (Digispark clone)
2 × MAX9812 microphone amplifier board Thermal Management and Protection / Heat Sinks
1 × WS2811 led
1 × MFRC522 RFID reader
1 × Piezo buzzer