• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Solar Water Disinfection Project

Not open for further replies.


New Member
So, we're building a solar water disinfection system. For my part (electronics), I am controlling the pump (on/off) during a certain percentage of a 2 minute cycle (that repeats FOREVER) depending on the sunlight intensity (300-400nm is desired detection range). The microcontroller is controlling the pump. The inputs to the microcontroller are the float switch(es) and photodiode (in a circuit with an op-amp so op-amp output is microcontroller input). The outputs from the microncontroller are to the solid state relay (which controls pump via outlet (box?) and solenoid valve.
I'm sooo confused about the voltage supply. I'm using the Arduino (Atmega328 - assembled) - Duemilanove w/Atmega328 development board, on adafruit http://www.adafruit.com/index.php?main_page=product_info&cPath=17&products_id=68, it says it uses a 9 VDC wall adapter, could it use 12 VDC (or would that simply NOT fit)? I ask about the 12 VDC because the solenoid valve takes 12 VDC. Also, for the schematic I say everything is hooked up to a 5 VDC source (could that easily be changed to 9 or 12 VDC) & WHAT is that source (Oh YEAH, I think I remember now, it's hooked up to the board! NEVERMIND about where it gets the VDC from) Will/ Should those other parts be on a breadboard (when I get it working I plan on soldering the parts to a PC board)? Is anything missing?
- Solenoid Valve (2V025 1/4): I feel like I just plopped the solenoid valve in, does it need a resistor or anything?
- Solid State Relay: I picked the D2W203F because the pump draws an average current of 1A, but draws 2.6A when it starts up. I soooo DON'T get the solid state relay configuration.
WHAT is it hooked up to? I thought it is connected to a wall outlet (120 VAC) AND another outlet box (i got, nothing connected to it) that the pump will be plugged into, is that wrong? I liked the portable box because it seems easy to test with (portable), I can't be messing with the wall especially since in that room is not where we'll be testing, we're testing the complete system on the roof) AND how will I get the thing to turn on again if the power supply for the microcontroller and/or breadboard is plugged into that (once microcontroller tells it to turn off, how will it turn itself back on without power)? What are the voltage sources, it says + VDC & - VDC, especially the -VDC? From the development board AND what else? What gives -VDC?
- Float Switch (FLT133): I just got the float switches and they have 1 black wire/cord that's split at the end into two metal 'leads', is that right? How do I know what goes to VDC & what goes to ground or does it matter?? Most importantly, will it WORK? (I think I know, it doesn't matter) NEVERMIND that question. More importantly, with that configuration, the resistor's ok right? So, I didn't ask about the photodiode because I think that's set, can the op-amp be replaced with another 741? I'm just in the buying process and trying to stay under our littttle budget and get what I need at once to save on shipping. If you have any alternatives, I'd be open to hearing it. Plan on ordering everything by 9/25/09 the latest. Here are all the parts I'm planning on buying. Attached is a pic of an OLD schematic, just some parts names changed and the solenoid valve is an input to the microcontroller, that's all that's different. Thanks for all the advice and input.

Solenoid Valve (2V025 1/4): Direct Acting Solenoid Valve
Photodiode (PC2-2-TO52): http://www.electro-tech-online.com/custompdfs/2009/09/PC2-2-TO52.pdf
Solid State Relay (D2W203F): D2W203F Crydom Solid State Relays
Operational Amplifier (TLC741CP): http://focus.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=TLC271&fileType=pdf
Float Switch: http://www.electro-tech-online.com/custompdfs/2009/09/FLT133SpecSheet.pdf



New Member

hey i m doin a project on..

Remote monitoring of Generator using GSM modem Implemented in BTS
Introduction :

Often in the base transceiver station(BTS) there is a power failure and a generator is to be turned on to keep the BTS in working condition. Here in our project we monitor the diesel level in the BTS and send the information to the GSM modem. The information is through SMS. Information includes the BTS name and the diesel level. We further would create a virtual personal area network using four GSM modem which will monitor their respective BTS and will send the message to the controller server. Hence an immediate refill of diesel can be called and avoid failure of the system. This will avoid the failure of BTS and will provide caution before the system fails. An effective wireless network can thus be established .

Objectives :
1. Design a circuit for measuring the diesel level using float switch.
2. Interface the float switch to ATMEGA32 based development board.
3. Code the ATMEGA32 to decode the voltage level sent by the switch.
4. Further coding for generating appropriate message for transmission.
5. Interfacing ATMEGA32 to the GSM modem.
6. GSM modem will push the message to the server.

Applications :
1. The system can be efficiently made use in BTS.
2. The system can be used for remote monitoring of generator diesel level or even for that matter for water tank also.
Extension :
This project can be extended for interactive monitoring that is receiving message from sever and processing it and taking the appropriate action.

please tel me how to take the current value from fkoat switch to the board ????.... help me........
Not open for further replies.

Latest threads

EE World Online Articles