This project has only a few modifications from the Single Chip, Four Channel Datalogger article, so I won`t go into much detail. Below is the schematic. The changes from Dan`s datalogger are that I used the PIC16F886, which is pin-compatible with the PIC 16F876. I also used the PI`s hardware serial I/O channels (pins 17 and 18) and I added
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Can indicator LED that indicates logging in progress and the log interval (pin 22). The switch sets the mode between logging and writing data over the serial port. The C data logger code is available here as is a hex file with 1 s log interval. I used the CCS compiler. This makes reading and writing program memory very straight forward with commands like write_program_eeprom( prog_mem_adr, value ) and read_program_eeprom(prog_mem_adr). The 16F886 has 8192 total program flash words. The total time of logging is determined by the delay setting at line 64 of main. c. Use a frequency counter at the indicator LED to set the desired logging interval. If you don`t add any lines to the code, you can increase the memory used for logging by setting START_ADR to the lowest open memory address. You can get this information with, e. g. , the PICKit2 programming application or whatever your favorite PIC programmer provides. Here`s the completed logger with a LM35 temperature sensor (suspended in the foreground) and a 7805 regulator (on the back left corner of the board) with a 9V battery attached.
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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