darkroom timer with PIC 16F84A
Posted on Jul 11, 2012
New Circuits
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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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Here is the circuit diagram of simple but highly effective TV remote jammer circuit. Most of the...
Originally, the prime harmonics were generated with 74HC4046 PLLs which were spot-on accurate but...
The circuit has negative feedback only for positive signals. The inverting input can only get...
Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit....
Here the schematic diagram of 100W Inverter Circuit which will convert 12VDC input to be 220VAC...
The PIC18F4550 chip contains more features than the PIC16F including a module for USB...
This circuit was designed on request, to remotely monitor when a couple of electric heaters have...
The circuit shown here is used to switch on a lamp when the tele- phone rings, if the ambient...
A stepper motor is a motor controlled by a series of electromagnetic coils. The center shaft has...
A typical application example shown, SAA1042 12V stepper drive motivation, phase winding current...
AC-DC power supply without power switching circuit normally used for lighting load circuit, once...
Circuit Principle: Using LC oscillator frequency drift is more serious. SAW devices appear to...
Circuit shown in Figure 3-147. To allow sufficient braking time, using the time relay KT (1 ~...
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