The circuit built is an integrated platform for each components that run the different systems of the bioreactor. We develop a board with female header pins that are integrated to each other. These female header ports allow the user to plug in an Arduino, three stepper drivers and other required components onto the circuit. This was done mainly to incorporate the idea of re usability. That means if you burn or short circuit one of the components and it gets destroyed then you can plug it out and use a new component in the circuit rather than discarding the whole board. The circuit receives power from two different sources, i.e 5 volts of the arduino and 12 volts from an external source. The controlling or the communication of the circuit board to the software is done by software serial through USB port of the microcontroller.
Specifications :
- Board Length - 100 mm
- Board Breadth - 80 mm
For the schematic files and .brd printable version of the circuit please check [http://igem.rwth-aachen.de/2015/index.php/Engineering/Files here]
Schematic
Circuit Protocols
We use a definite set of ports of the arduino for each one of our devices.
Arduino Pins Protocol
| Pins |
PWM |
Name |
Device
|
| D2 |
No |
F_Enable |
Feed Pump
|
| D4 |
No |
Valve Transister |
Valve
|
| D3 |
Yes |
OD Transister |
OD
|
| D6 |
Yes |
Stirer Transister |
DC Motor
|
| D7 |
No |
A_Enable |
Aeration Pump
|
| D9 |
Yes |
A_Step |
Aeration Pump
|
| D10 |
Yes |
H_Step |
Harvest Pump
|
| D11 |
Yes |
H_Enable |
Harvest Pump
|
| D12 |
No |
Direction |
All Pumps
|
| D13 |
No |
A_Step |
Aeration Pump
|
Power Supply
The arduino is powered by 5 Volts from the computer. There always remains a possibility to use the Vin ports to switch the circuit ON without a laptop or a computer
The Pumps use a power supply of 12 Volts and there we use a Switching adapter (Model Number : HNP24-120)
Input : 100-240 VAC, 50/60 Hz 0.8 A
Output : 12 Volts, 2000 mA