Video of working circuit
This is a video of the working circuit.
We did have a few problems with the wiring where it wasn't downloading the code to the pic. So we decided to undo the wiring bit by bit to see where the problem was. First we got the LED's working, then the motors wired up, then the switch and finally the LED to show which program it was in.
On Monday the buggy will be assembled completely to test the code of the line following buggy.
Above the wiring can be seen. The wiring of board includes a switch, two motors, an LED and two LDR's.
The LDR's where wired 1st and have two variable resistors so that the sensitivity of the LDR's can be changed for the application. The switch is a pull up switch so that when it is not pressed the value into the pin is 0 and when it is pressed the voltage is pulled up to 5 volts in the pin. Both the switch and the LDR's are wired into the input side of the PIC and the LDR's are in pins 0 & 1 as these are analog inputs.
The motors are wired into the output side of the PIC and each motor is also wired into the darlington driver so that enough power can be created to drive the motors. Each motor has a resistor on the board so that a short isn't created. The LED is also wired into the output side of the motor and has a resistor so a short isn't created.
The wires from the board have been bent around the bread board so that the pic, darlington driver & battery pack can be rested ontop and the board can be flipped upside down for orientation.
The LDR's where wired 1st and have two variable resistors so that the sensitivity of the LDR's can be changed for the application. The switch is a pull up switch so that when it is not pressed the value into the pin is 0 and when it is pressed the voltage is pulled up to 5 volts in the pin. Both the switch and the LDR's are wired into the input side of the PIC and the LDR's are in pins 0 & 1 as these are analog inputs.
The motors are wired into the output side of the PIC and each motor is also wired into the darlington driver so that enough power can be created to drive the motors. Each motor has a resistor on the board so that a short isn't created. The LED is also wired into the output side of the motor and has a resistor so a short isn't created.
The wires from the board have been bent around the bread board so that the pic, darlington driver & battery pack can be rested ontop and the board can be flipped upside down for orientation.
While the circuit hopefully worked you can see you were pushing for time. The most successful groups had a powered chassis with onboard sensors and circuits running before Easter. This then gave them the time to optimise code, sensor positions and ensure circuit robustness.
ReplyDeleteBringing everything together a day or so before the deadline was never going to be ideal.