Arduino TC4+ Quick Start Manual page 9

HC-05
CH2- CH2+ CH1- CH1+ CH4- CH4+ CH3- CH3+
- OT2 + - OT1 + GND VIN
GND +8-28V
DC PSU
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.
TC2 (bean temp)
TC1 (air temp)
TC4+
DC+ DC-
9
Roast Chamber
heater
thermal fuse
fan
flyback diode
SSR
AC