The TC4+ is an Arduino shield for home coffee roasters. It provides the following features:

  • 4-channel thermocouple interface.
  • 2-channel SSR drivers for AC loads, and single-channel DC driver for DC fan motors.
  • Full compatibility with TC4-based Arduino sketches and established software ecosystem.
  • Highly simplified control of popcorn machine based roasters: On-board voltage regulator and DC PWM driver allow popcorn roaster setup with just the CR3, a single DC power supply and one solid state relay.
  • Designed with a high degree of flexibility in mind. Wide range of voltage regulators supported; extra I2C headers for displays and other peripherals; retains all TC4 features and full Arduino pinout.
  • Wireless control with optional Bluetooth module.

There are two options available for ordering the TC4+. Please use the respective PayPal buttons below:

  • A kit version, which includes the PCB with surface-mount components already soldered, plus loose through-hole components for you to solder. This is the most cost-effective options, and requires a modicum of soldering skills. This comes to GBP 45 each, plus shipping.
TC4+ kit
GBP 45

  • A fully assembled version, which has all the soldering done for you, for GBP 89 plus shipping.
TC4+ assembled
GBP 89

Shipping is GBP 11 for all orders, included in the PayPal links above. For custom orders (e.g. including a pre-configured Arduino) please contact me at Given that this is a one-person side project, dispatch times can vary, but will usually be within a few days. Shipping is via Royal Mail tracked & signed and tends to take about a week within Europe, and one to two weeks to the US. Sales are through Artisanal Technologies Ltd.

TC4+ board side view