Week 2 - 10/3/2017
This week we had a group meeting to discuss how to adjust
the sensor circuit and collate any research we had independently sought out. We
found a slight change in the variable resistor to be the issue as well as mess
spot of soldering, and so we re-tested the circuit on the breadboard and then
transferred to a Vero board. This time having a slower and more accurate
approach to the technique proved successful and so after running the
approximated voltages through the circuit using the Multi-meter we moved on to
the next task.
Below showing the
first and second successful attempt at the sensor circuit:
Sensor circuit attempt 1
Sensor
circuit attempt 2
One of the main aims for our project to achieve is to be
able to read a distance of an obstacle in front of the robot car and for the
car to react to this and adjust its path to avoid the obstacle. To do this we
are going to use a 3-pin Ultrasonic sensor. This circuit will be very simply 3
wires coming from the sensor to plug into a small breadboard and then connected
to the Arduino at a later date. These 3 wires will
be:
- · Connected to ground
- Connected to a signal source
- Connected to a 5v source
As we discussed last week we
tested the toggle switch, which came with the mobile platform, using a power
supply and Multimeter, to see if the was a valuable extra. After understanding
how the switch works and how we could connect it to our circuitry, we then connected
it to the battery holder. Essentially we can now switch on/ off the supply from
the battery holder to the remaining circuits, this therefore giving us more
control over the use of the RC.
Problems and issues:
In an attempt at starting the motor drive circuit,
we realised that the IC chip required for the motor drive circuit was not ordered.
The lack of the IC chip, LM293 dual h bridge, is not an issue but has caused a
slight delay on the building and testing of the motor drive circuit.
This chip allows us to control each motor separately
allowing for the robot car to move in different directions including backwards.
Hopefully when we test it and investigate what we can do with this chip we will
be able to use it to its full ability and progress our design to the next
level.
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