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| group2:electrical_proof-of-principle_outline 2008/12/09 02:33 | group2:electrical_proof-of-principle_outline 2008/12/09 13:51 current | ||
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| the photodiode detection of light, and the third is the serial communication with the | the photodiode detection of light, and the third is the serial communication with the | ||
| microcontroller. | microcontroller. | ||
| + | |||
| For the first test the microcontroller was programmed to emit four square wave signals, each | For the first test the microcontroller was programmed to emit four square wave signals, each | ||
| connected to two BJTs, that provided current for a particular wire from the motor. The stepper | connected to two BJTs, that provided current for a particular wire from the motor. The stepper | ||
| - | motor has two windings that generate an magnetic field when a current is passed through. By | + | motor has two windings that generate a magnetic field when a current is passed through. By |
| alternating current through the two windings, the motor can be “stepped” at a desired rate. The | alternating current through the two windings, the motor can be “stepped” at a desired rate. The | ||
| microcontroller will be sending waves with a period of half a second. These pulses causes the | microcontroller will be sending waves with a period of half a second. These pulses causes the | ||
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| output data, and input data. Since there is no information going from the PC to the PIC, the input | output data, and input data. Since there is no information going from the PC to the PIC, the input | ||
| data line will be grounded. The PIC will send out voltage pulses through the output line and the | data line will be grounded. The PIC will send out voltage pulses through the output line and the | ||
| - | PC will receive these via a serial monitor. The serial monitor used is part of the PICC compiler | + | PC will receive these via a serial monitor. The program is coded with the printf command, and with |
| - | software package. We have not yet devised a method to properly send signals through the RS232 | + | the help of the RS232 setting, any ASCII word can be transmitted to the PC. The serial monitor |
| - | connection, so these signals will be unintelligible. | + | used is part of the PICC compiler software package. |
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