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For 2 I made sure to reuse the original design in some way but adapt it to my own needs.

But then I stumbled upon one of my first electronic kid toys ever, a Raccoon RC car that was in really bad condition. Notify me of new fransistor via email.

DC motor control (reverse engineering that old toy pt.1) – after hours coding

Leave a Reply Cancel reply Enter your comment here This site uses cookies. Note that in the image above the transistor has the base as the center pin. From my first drawing things looked way too complicated, but after reading up a bit about DC motor control through H-bridge NPN and PNP transistor configurations I trnasistor they did exactly the same thing in this circuit. Notify me of new posts via email. What is so different here to most schematics is that 2 motors are driven from the same circuit.

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While Q6 and Q8 handle the current for their motor only, the current comes together at returns leads from each motor and is than flowing into Transidtor which should so be able to handle both currents together. The two horizontal resistors central in the picture are the motors M1 and M2. For each pin I first had 22k resistors connected to the transistor base but later I swapped these to 1k resistors as the transistors that I have never came to conduct.


Though it did not hold me back to start measuring around and understanding what kind of voltage and current levels are involved in driving the motors, because when you get that there is not much more holding you back from throwing in an Arduino or Raspberry Pi for tranisstor to do the rest of the task.

I however soldered mine because my breadboard x3279 still in use for some other project. As far as 1 goes, that is something I can handle in software Arduino.

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You are commenting using your Twitter account. To find out more, including how to control cookies, see here: A breadboard sketch would look like this: Because of the remote control missing I had to reverse engineer the current circuit board inside the car.

Also note in the above schematic the potentiometer on top which allows one to correct the differences in motors speed as one motor will never be exactly the same as the other one.

A breadboard sketch would look like this:.

Fill in your details below or click an icon to log in: But the above on is also working, but you must keep in mind two things: From my measurements I found the motor control circuit to look something like this: By continuing to use this website, you agree to their use.


The car architecture is as following: You are commenting using your Facebook account. So far example, if you want to drive forward one should make Q6 and Q8 conducting and also Q10 in the middle.

Unfortunately, the toy is like 30 years old and so off course the toy is based upon analogic components instead of digital ones, and off course with the datasheets of some components are missing. The tranaistor were rated good enough for the old circuit so they should be good enough now too. Email required Address never made public. So no fun, unless… And so I decided to revive this toy, not because I like RC cars that much, just because off having something to do during the day-hours of the festival and to recover from parties the day before.

The car has no wheel that can turn so the only way of making corners is by having transistod speed on the wheels for each side. Skip to rransistor Home About. If the left wheels are turning slower than those on the right, the car will turn left.