Arduino TC4+

HC-05
STATE RX TX GND VCC EN
TC4+
CH2- CH2+ CH1- CH1+ CH4- CH4+ CH3- CH3+
TC2 (bean temp)
TC1 (air temp)
Roast Chamber
- OT2 + - OT1 +
SSR
thermal fuse
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