It has 16 timers that can be independently paused and restarted, and can run forward or backward. There are 16 alarms with configurable sounds and actions. Timers can show Earth, Mars, Jupiter, etc. times at the same time. How about sidereal time, Moon phase, Jupiter's Great Red Spot transit time, and anything periodic in general? Simultaneous 24-hour and Julian-time decimal display. All changes in configuration can be done from the device's keyboard - no computer necessary. External AC power with built-in rechargeable battery, so you can take the clock around. High on the geekness scale.
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The 5V Power Supply block contains the voltage stabilizer and filtering capacitors from the power supply on the modem board.
The Speaker Amplifier block is the LM386-based amplifier circuit that was on the original modem board. The speaker is the internal modem speaker.
The PICkit 2 Programmer port is intended for reprogramming the microcontroller without disassembling the clock. The DB25 to 6-pin adapter (see the picture) is not shown.
If your keyboard has different layout than the one shown, refer to Using Different Keyboard in the Code section.
I used a Techstar 16 characters * 2 lines LCD Module with backlight. These modules are pretty standard, so almost any 16x2 LCD module will work. Backlight is a plus, but it is not mandatory.
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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