Figure 1: The TC4+ board and its on-board components.
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Overview
The TC4+ is an Arduino shield providing a 4-channel thermocouple interface
and driver logic for AC and DC loads. The main components on the board are
shown above in Figure 1. The next page shows all connectors and status LEDs
schematically. The most important components are:
•
4-channel thermocouple interface using high-resolution ADC with cold-
junction compensation for accurate temperature monitoring.
•
DC In and DC out screw terminals; voltage regulator to supply the Ar-
duino from DC In; MOSFET to control DC Out.
•
OT1 and OT2 screw terminals to control SSRs.
The rest of this guide will briefly describe how to assemble, connect and configure
the TC4+ board in common scenarios.
Important:
This is only a quick start guide, and only about interfacing the
TC4+ board. It is not a guide on how to build your own coffee roaster. Do
your own research, especially regarding safety. The TC4+ is intended for use
by qualified professionals. If you are not qualified to work with mains electricity
and in fire safety, get professional help.
Important:
The TC4+ includes several components that are very sensitive
to electrostatic discharge, including the ADC and temperature sensor in the
thermocouple interface, and the IRF540 MOSFET for the DC driver. Follow
appropriate procedures when handling the TC4+. Failure to do so may result
in damage to these components.
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