This PIC microcontroller EEPROM project saves the temperature from an LM35DZ IC to the PIC`s internal long term data storage area. The project follows on from the last project using the virtually the same hardware. It stores temperature readings internally at regular intervals until full and after this it turns on the LED. The LED is really just f
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or showing that something is happening and in a real data logger you would not use it. Note: This project is not optimized for power consumption so the best way to use it is powered from a power block. The current consumed is about 13mA (LED off) 16mA (LED on at end). If you want to use a battery use a rechargeable PP3 and do not attach the LED. The 12F675 may not the best PIC microcontroller to use for low power data logging and a better choice would be the 16F88 as it can change its internal oscillator on the fly going into slow (current saving) mode. But you could use the 12F675 with a slow external 32kHz crystal. At every ADC reading the LED is flashed briefly and when you select a 500ms reading interval you can see the readings being taken. When 64 readings are accumulated the LED is lit permanently - showing that the data store is full. Note: For this chip you only get to store 64 results as you need to store an unsigned integer for every ADC result and this takes 2 bytes so 128 Bytes/2 = 64 results. The solderless breadboard and circuit diagram are nearly the same as used in the previous project so if you have already built it you don`t need to do any more. Just add the blue wire, D2 and R6. At start up the led is flashed three times. If you hold the button at start up the LED is flashed six times and the internal EEPROM will be erased ready to start logging the temperature again. As mentioned before setting GP3 high...
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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