It uses body heat to locate and track its human master. At heart of this heat seeking capability is the Devantech TPA81 Thermal Sensor Array. The TPA81 consists of an array of eight detectors mounted horizontally. Each of the detectors is capable of detecting infrared at radiant heat wavelengths. The array also provides the current ambient air temperature.
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By comparing the detectors to the ambient temperature it is relatively easy to detect the presence of a human body and determine its direction. This robot uses a Scorpion motor controller to drive the four DC motors. The motors are wired in two pairs with one pair for the right side and the other on the left. The Scorpion does all the processing required to give smooth coordinated turns. Since I did not want to generate the servo signals directly I used a Parallax Servo Controller (PSC). The PSC takes simple serial commands and then does all the work of generating the servo pulses. Power for the motors is supplied from a single 7. 2 volt 2800mah battery. This battery is for the motors only. Power for all the other electronics is supplied from a second smaller 1600mah battery. The batteries are capable of running the robot for over an hour. For this application the Basic Stamp is the Mission processor. All the behaviors for this robot`s mission are controlled by this processor. It takes in sensor information and in turn controls the motion of the robot via the motor system. The Stamp is programmed in a language called PBASIC. Although not the most robust language, it is simple to use and modify. This makes it an ideal language to write the high level mission code. There are three major sensor systems which connect to the Basic Stamp. Mounted on the upper deck of the robot are the proximity and thermal sensors. The...
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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