Laser Pointer Train Detector
This train detector makes use of hand held laser pointer devices that are widely available to detect trains over long distances....
Laser Pointer Train Detector
This train detector makes use of hand held laser pointer devices that are widely available to detect trains over long distances....
Light Detector Circuit
Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1`s value is chosen to match the photocells resistance at darkness. The circuit...
Light Detector Circuit
Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1`s value is chosen to match the photocells resistance at darkness. The circuit...
Day and Night Infrared Detection
The following is a method to allow day and night detection using Infrared/Visible light sensitive phototransistors and a simple LM339 voltage comparator circuit...
Day and Night Infrared Detection
The following is a method to allow day and night detection using Infrared/Visible light sensitive phototransistors and a simple LM339 voltage comparator circuit...
Dark Activated Switch circuit
This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an ext...
Dark Activated Switch circuit
This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an ext...
LED Sensor Electronic Tracker with H-Bridge Drive
I decided to make a commercial surface mount PC board using the LED2 sensor concept. It is quite sensitive and can track to a few degrees of accuracy in bright ...
LED Sensor Electronic Tracker with H-Bridge Drive
I decided to make a commercial surface mount PC board using the LED2 sensor concept. It is quite sensitive and can track to a few degrees of accuracy in bright ...
Home Brew Compass Sensor
With our design, it takes two readings by the RCX to get one complete reading from the compass sensor. Software then must combine those readings together to det...
Home Brew Compass Sensor
With our design, it takes two readings by the RCX to get one complete reading from the compass sensor. Software then must combine those readings together to det...
Small Lie Detector
Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. ...
Small Lie Detector
Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. ...
Lie Detector
The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five ...
Lie Detector
The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five ...
Digital-Output Sensor Simplifies Temperature Acquisition
The TMP03* is a complete temperature data-acquisition system on a monolithic silicon chip. Including a silicon-based sensor, internal voltage reference, and sig...
Digital-Output Sensor Simplifies Temperature Acquisition
The TMP03* is a complete temperature data-acquisition system on a monolithic silicon chip. Including a silicon-based sensor, internal voltage reference, and sig...
Accelerometer Schematic
Below is a rough schematic of the layout of the accelerometer PC board looking from the component side. The microcontroller is an Atmel AT89S8252, an 8051 clone...
Accelerometer Schematic
Below is a rough schematic of the layout of the accelerometer PC board looking from the component side. The microcontroller is an Atmel AT89S8252, an 8051 clone...