I proposed a solar powered watering system for the plants to water them daily from the water butts by the greenhouse. As with all my projects, this has been work in progress for a long time now, but I have picked it up again with the intention of completion! View of the control box with the lid off showing all the major system components. Pumps go on the base, control and battery on the
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lid (in case of leaks the electronics don`t get flooded) Main control PCB top side showing switching FETs (top left), control and timing (left) and power filtering / switching (bottom right). Top left is a not yet implemented MPPT controller circuit. Main control PCB bottom side. Power supply connections made with tinned copper wire, other connections made with enamelled copper wire (transformer wire). Note D2PAK transistor for switching the power rail. The control panel end that will be visible in the greenhouse. Dial of timing pot marked in 0. 5l increments to 2l. Force watering button and power switch. LED indicators to show which pump is active and if the control circuit is powered. At the other end of the case, a 15-way D-type connector forms the connection to the alarm clock. 3. 5mm stereo jack sockets form the connection to all 8 soil moisture sensors as well as the solar panel. Some kind of low power water pump is required so I picked up a couple of generic windscreen washer pumps from eBay (much cheaper than Halfrauds ). These are 12V rated, but judging by the power consumption they are not designed for continuous operaton. To decide how big the battery needed to be, I needed to characterise the pumps performance. To do this I pumped a pint of water between two milk bottles, varied the voltage and measured the time taken for the transfer. Measurements are in the below table. This is better shown in this graph below...
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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