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TC4+ Arduino Shield

Quick Start Guide

April 20, 2019

Contents

1

Overview

2

2

Assembly (kit version)

3

3

Connecting to your roaster

5

4

Software

10

1

Summary of Contents for TC4+

Page 1: ...TC4 Arduino Shield Quick Start Guide April 20 2019 Contents 1 Overview 2 2 Assembly kit version 3 3 Connecting to your roaster 5 4 Software 10 1 ...

Page 2: ...s 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 qual...

Page 3: ...it comes with a R 78E5 0 switching regulator Yellow C12 C13 10uf ceramic capacitors C1 C2 are not used with the R 78E5 0 switching regulator Green labelled TFAN IRF540 transistor Optionally fixed to board with M3 screw Notes 1 BT SEL 2x3 top left and BT RST 1x2 bottom right are for jumpers so male headers are required For the I2C IO2 and IO3 headers a different connector could be used if preferred...

Page 4: ...EL jumper set to BT Serial BT RST BT RST jumper BT Reset enabled CH2 CH2 CH1 CH1 CH4 CH4 CH3 CH3 Thermocouple header OT2 OT1 OT1 OT2 headers GND VIN INPUT DC input DC DC FAN DC fan output POWERLED Power LED OT1LED OT2LED OT1 OT2 status LEDs Figure 3 Layout of all connectors jumpers and status LEDs on the TC4 board 4 ...

Page 5: ...se are provided in an 8 pin screw terminal near the north edge of the board Due to board layout constraints the order of the pins is not ascending but in order CH2 CH2 CH1 CH1 CH4 CH4 CH3 CH3 See Figure 4 for details Usually you will want to use one K type thermocouple probe each to measure bean temperature BT and air temperature ET Connect ET to channel 1 and BT to channel 2 Positive and negative...

Page 6: ...on to usual current flow See Figure 5 This is to prevent damage to the MOSFET Either solder an appropriate diode to the motor preferred or screw it into the screw terminal together with the motor power cables Be careful of correct polarity or you will create a short Make sure the diode is rated appropriately If your motor was originally connected to a bridge rectifier you might want to reuse one o...

Page 7: ...detector beyond the scope of this guide To control an AC fan via a PWM dimmer module you will need a PWM dim mer module One verified option is this https www tindie com products bugrovs2012 pwm ac light dimmer module 50hz 60hz To connect this use a three pin cable to connect the PWM header on the PWM dimmer board to the TC4 5V goes to 5V GND goes to GND PWM goes to IO3 The AC side of the PWM dimme...

Page 8: ...l connects to a solid state relay SSR which in turn controls the AC live wire going to the heating element A thermal fuse in series with the heater is strongly recommended Figure 7 gives a schematic with all these connections 3 9 Further Connectors Jumpers Status LEDs Further to the connectors discussed the TC4 features the headers jumpers and status LEDs listed below IO2 IO3 break out the Arduino...

Page 9: ...e heater LIVE NEUTRAL GND VIN DC PSU AC GND 8 28V DC DC fan flyback diode Figure 7 A typical application example of the TC4 board This shows the TC4 board connected to a DC PSU a fan with flyback diode a SSR controlling a heater with thermal fuse a HC 05 Bluetooth module and two thermocouples measuring bean and air temperature 9 ...

Page 10: ...master applications Artisan aArtisan_PID trunk src aArtisanQ_PID For all the configurations discussed in this guide you will want to use this in PWM configuration mode 4 2 Artisan You will usually want to use Artisan on your host computer available at https artisan scope org 4 3 Bluetooth module See separate guide for Bluetooth configuration 10 ...

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