week 2

In this week, we started to build the drive circuit. However, we met serial difficulties.  Because the motor still not arrived, we tried to use a 3-6V motor (shown in Figure 1) connected with a resistor in series to replace the motor we required.

Figure 1

Using the 3-6V motor was just the alternative method that we could build and test the circuit. We used breadboard to build the circuit, shown in Figure 2

Figure 2

 However, the connection inside breadboard was not reliable, as a consequence, during testing, the results were not stable. The tested voltage between pin 2 and pin 10 (which is the voltage of motor) could be correct sometimes, other times it appeared to 0V, which means the drive circuit was an open circuit, whilst the input voltage (between pin 6 and pin 7) was correct.

After eliminating the error of circuit, the only possibility that may cause this problem was the connected inside breadboard opened. We built the circuit again in a new breadboard, the testing results were better than former testing, but still had some error results.