4. Hardware
Hardware details for paperd.ink
Block Diagram

- ESP32-WROOM-32 module
- FCC/CE Certified WiFi & Bluetooth for connectivity
- <20uA current consumption in sleep mode
- CP2104 USB-UART converter onboard for programming
- MicroSD Card slot for storing images, files, etc
- Piezo Buzzer for notifications and alerts
- 4x Tactile Buttons for user input
- Battery Charger circuit to keep it truly wireless
- Extension Header for interfacing and expanding capabilities
Pin Map
- UART, SPI, and I2C so you can add external sensors and modules. This makes the board extendable.
- 8 I/O for controlling any output and receiving any input.
- Disable ESP32 module using ESP_EN pin to reduce power consumption.
- Disable the entire board using LDO_EN pin and have virtually no current consumed by the board.
Battery
While selecting a battery for paperd.ink please note the polarity of the connection. A battery with in-built protection circuit is recommended.
Design files
Dimensions
- The PCB is 92.1 x 78.1 mm
- The enclosure is 98 x 82 x 16 mm