I want the final package to be as invisible as possible, and without any wires / adapters / etc. Obviously that requires me to run this project from a small battery. To preserve power, I`m thinking about putting the ATMega (eventually probably the ATTiny) into deep sleep, and wake it up once every 30 minutes or so. Let it sense the moisture level, send out a package,
Click here to download the full size of the above Circuit.
and go back to sleep again. Probably a button too, to trigger an extra measurement (if that`s feasible without having to keep the ATMega out of deep sleep to continually watch for a button press. ). As I was worried about battery life, and if this could even be done with a small battery (I plan on using a CR2032), I started a different topic to first see if it would be feasible. Turns out it`s possible to run a JeeNode off of a CR2032, and let it send packages over the RFM12B transmitter (thanks JCW, and everyone else who helped out)! I`ll be needing at least a moisture sensor circuit of course, and preferably a temperature sensor as well. As the temperature influences the reading from the moisture sensor. I will be needing dozens of these - or similar enclosures. Same criteria: cheap, small, water resistant. Add to that: easy to duplicate, modular and use the hundreds of 9v batteries I have at my disposal. So, I needed something easy to access. Here is what I settled on: (see attached) It`s a made from standard pvc water pipe. I mount a RJ11 T-Adapter in the endcap on one end that I get from from Monoprice. I pop off the back of the adapter and mount a little 6-pin header for the Jeenode to "plug in". It`s not connected to anything. Just serves as a mounting point. The wires I solder up to some male 6-pin connectors with whatever resistor is required right from the T connector wires. This one happens to be for DS18B20...
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.....
characters left: