Wiring TFT Display

Use a 10-wire silicone ribbon cable to connect the TFT display to the QT Py. Measure and cut the cable so it's about 11cm (4.3in) in length. Peel wiring so there's only 8 of the 10 wires. The TFT display needs 8 wired connections to the QT Py.

Solder TFT Display

Using wire strippers, remove a bit of insulation from each wire. Tin the tips by applying a bit of solder. This helps prevent the strands of wire from fraying. Solder all eight wires to the following pins on the TFT.

  • VIN
  • GND
  • SCK
  • MOSI
  • TFTCS
  • RST
  • DC
  • Lite

Wired TFT Display

Double check all of wires are properly soldered to the pins on the TFT display.

Key Plate and Switches

Four mechanical key switches are press fitted into the 3D printed key plate. Choose which style of cherry mx compatible key switch to use. 

Install Key Switches

The mechanical key switches are press fitted into the square holes. The key plate is symmetrical so the switches can be installed on either side.

Key Switch Wires

Use a 10-wire silicone ribbon cable to connect the four key switches to the QT Py. Use the following wire lengths.

  • 3x 1-wire ribbon cable - 25mm (1in)
  • 1x 5-wire ribbon cable - 127mm (5in)

Solder Key Switches

Start by soldering the ground pins together using the short single wires. To daisy chain together, ground pins will share two wires. Solder one wire from the 5-wire ribbon cable to one of the ground pins. Solder the remaining wires to the signal pins on the switches.

QT Py Wiring

Double check the wiring from the key switches and TFT display. Get the QT Py RP2040 ready to wire.

Wiring TFT to QT Py

Solder the wires from the TFT display to the pins on the QT Py. Make the following connections.

  • V+ from TFT to 3V on QT Py
  • GND  from TFT to GND QT Py
  • CK from TFT to SCK QT Py
  • SI from TFT to MOSI on Qt Py
  • TC from TFT to RX on QT Py
  • RT from TFT to TX on QT Py
  • DC from TFT to SCL on QT Py
  • BL from TFT to SDA on QT Py

Wired TFT Display and QT Py

Double check the wiring is correct and the solder joints are solid.

Wiring Switches to QT Py

Get the key plate switches ready to solder to the QT Py.

Solder Switches to QT Py

Solder the four signal wires from the keys to the QT Py. Solder the ground wire to the ground pin on the QT Py.

Wired Key Switches

Double check all of the wires are correctly soldered. Check the solder joints are all solid.

This guide was first published on Jun 29, 2021. It was last updated on 2021-06-29 17:17:58 -0400.

This page (Wiring) was last updated on Sep 15, 2021.

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