Well, it took some time and a few failed attempt, but here it is. A neat project that lets you control two wheels or tracks from your PC serial port with no wires attached. I have it working at 2400 baud and that is about as fast as I can think. We assume you have a PC, so what else do you need First a Basic Stamp. I am using the Stamp I, but a B
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asic Stamp II would be much better for later expansion. Next you need a transmitter and receiver. The best deal (and they work too) are ones made by Ming available from Circuit Specialist. The next piece of magic is from Acroname (built by TI). This H bridge chip takes care of two motors. I have mine running up to three amps by stacking them and adding cooling wings to the ground pins. Now we add a couple of 7805 regulators, a 74HC14 inverter, a resistor and a couple of capacitors and that`s all we need. Well, we need wire, a fuse, batteries and of course a two wheeled platform, but that`s another issue. You may want to add a power on light and a speaker but for now they are optional. The Basic stamp is our brains. Pin 0 is our serin connection. I used pin 1 to drive a little speaker as explained in the PBASIC sound command. This is nice for troubleshooting the design. Pins 2-5 control our motors. Six and seven are left for other functions, like a bump sensor or a IR sensor, etc. The SN754410 is a great little chip. I just soldered them on top of each other until I had enough to handle 3 amps. The heat from this chip is transferred out through the 4 ground connections in the middle. I just cut out a piece of sheet metal and soldered it to both sides between the ground pins like vertical wings. Holding both motors stopped they get warm. Motor power goes to pin number 8. I am using a 3 amp fuse, should keep things in range....
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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