How to build an infra-red remote control
The infra-red remote control transmits a tone using an infra-red LED. This tone is decoded by the receiver.
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This page contains an archive of all entries posted to Gadget Freak in the Sensors category. They are listed from oldest to newest.
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The infra-red remote control transmits a tone using an infra-red LED. This tone is decoded by the receiver.
Continue reading "How to build an infra-red remote control" »
A device to measure the rays all around us, but it doesn't come under the 'tin-foil helmet' category. File it under delta-sigma ADC - it is a very detailed Solar Server project to measure the solar radiation striking Earth ("insolation"), recording the daily data to a file, which is then emailed.
Here's another newly-uploaded Circuit Design Idea designed to give circuit building inspiration (click on the circuit diagram to expand it).In some applications of capacitive sensors, the instrument's front end must be small enough to fit into a narrow space. Figure 1 shows a precision capacitive-sensor interface for such use. The square-wave output from a low-voltage 555 timer, IC1, constantly triggers the precision one-shot, IC2, to produce quasistable outputs for time periods T1 and T2, which are proportional to external timing capacitance: T1=KR0(CS+C0), and T2=KR0CS, where K is the multiplier factor.
Continue reading "Cycling robot survives s-curve balance beam" »
Ahead of the imminent March/April competition post, here is an Italian-themed round up of Gadget Freak posts.
Is that my phone ringing? By the flashing of light ye shall know...
You can set it up to indicate intrusion into a door, window, office or pool. It can also connect to a panic button. The circuit includes a small PIC microcontroller, an assembly program and a handful of other parts that can be designed to detect the interruption of a switch closure or the connection of a panic button. When the circuit is tripped, the gadget dials your number and indicates what device has been triggered.
Continue reading "Intrusion alert system dials your mobile" »
Continue reading "Stormbringer coming - Defend against the static!" »
Fancy taking the latest Circuit Challenge?
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