Inkplate 5V2 – Jumpers
Inkplate 5V2 has several on-board jumpers that change how certain components behave. Some are connected by default, others you need to short yourself.
The table below explains what each jumper does:
Board jumpers
| Jumper | Default State | Function |
|---|---|---|
| JP1 | NO (not connected) | When shorted, keeps the microSD card powered at 3.3v at all times. Useful for troubleshooting, but not ideal for low-power applications. |
| JP2 | Connected to INT by default | Switch between a digital, open-drain, active low interrupt output and a programmable digital square-wave output that can be used as a system clock. |
| JP3 | Connected to SPI_CS(IO15) by default | Switch between connecting the CS pin of the microSD card reader to the IO15 pin or the SD0 pin on the ESP32. |
| JP4 | NO (not connected) | When shorted, bypasses the 330-ohm resistor connected to the buffer, causing the ESP32 to enter bootloader mode. |
| JP5 | NC (connected) | When shorted, connects the GPIO0 pin to a 100pF capacitor, which gives more stable voltages. |
| JP6 | Connected to IO34 by default | Switch the INTB pin of the IO expander between the IO34 pin of the ESP32 and a separate solder pad next to the jumper. |
| JP7 | NC (connected) | Connects pin P1-2 of the IO expander to the MOSFET that powers the microSD card. Cut it and the card stays unpowered, but P1-2 is freed up on the neighbouring solder pad. |
| JP8 | NC (connected) | Connects pin P1-1 of the IO expander to the MOSFET that switches the battery voltage divider on for a measurement. Cut it and readBattery() stops working, but P1-1 is freed up on the neighbouring solder pad. |
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