AVR ISP interface (optional but handy if you don`t like the boot loader, are too poor for a JTAG or AVR studio just crashed and disabled the on chip debugging ;) ) The following is the up to date bill of materials for the latest version of the PCB. The parts are available from Farnell and digikey with the exception of a few items. If you cannot se
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e the list below then it is also available here. There is some basic software in the CVS that can be used to check the operation of the Hardware and test individual aspects of the hardware. You can find the systems test module here. (NOTE: This has not been updated for some time) The Rev_B design now includes a low drop out 3V regulator so power source is not really an issue, but if using 3V (2 x AA cells) then you can just replace the regulator on the PCB with a jumper from vin to vout. The Rev_C deisgn uses a MAX1811 to handle charging a LiION (4. 2V) Battery from a USB port. The design should really regulate the battery to 3. 3V, but doesn`t yet. The Rev_D board now includes a switched capacitor regulator (Texus Instruments REG710-3. 3) to maintain Vcc at 3. 3V. Using an unmodified Rev_C board will work but the life time of the MMC will be reduced. The Rev_E board has replaced the REG710-3. 3 with a National Semiconductor LP2891 ultra low dropout regulator. This component uses much less current than the former part, while allowing us to still extract power from the battery over its recomended operating voltage range
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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