Good vibe brothers metalheads, overlapping of influenza tests finally we bring the advances and setbacks we've had these past few weeks in building good Orcobot.
The ordeal began last week ... the Orcobot stopped working. We lost valuable days in the long and cruel process of elimination. We tested the communication between the microcontroller and the computer, we check the outputs of uC, separate the solenoid circuit, we tested individually control the robot from the HyperTerminal, in short, all the components work individually, however when the robot arm again nothing.
What was it that happened?
Javier Rubio was the teacher who showed us our mistake. Protection diodes in parallel with the coil.
"A coils are put on a reverse biased diode in parallel to protect the switching element (in this case the transistors) of the over-voltage causes the coil when it is switched. By switching a circuit with an inductance, the current "turns" in the coil, returning that power to the circuit, thanks to the diode, this current was biased and is discharged through it, without affecting the rest of the circuit. "
And because it worked without diodes?
With use, the layers that make up the emitter and collector formed a channel of the same type of material, in this state the transistor behaves with a FET (field effect transistor) which is controlled by a voltage differential and not to an amount of power as does the transistor, so the circuit stops working.
In short, the semiconductor layers are excited with the transistor current to the coil, which rendered the P-type material and N-type material hostiles.y do their bit by bit, we were throwing the transistors.
Putting protection diodes there is no return current that affects the transistor, therefore no hostilfest on the switch and transistors work properly ... Yeah!
modified circuit of protection diode or n cowboys Do not forget, protection diodes whenever something switched coils.
More information about transistors here.
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