ositadima1: @Dondbuzor dats dat is true, but are u fully into these projects, or part time? Is there a thriving market for this kind of projects in nija? Where i stay they have this motor dat pumps water into a tank, the wahala is dat u have to switch it on manually when ever there is light, and of when it feels up, a controller can automate this chore

There are different ways to solve this problem. One way is to use magnetic reed-switches(sensor) arranged vertically across the height of the Tank at various points. A magnet strapped to a floating mechanism aligned close to the reed-switches will indicate current position along the Tank height as it gets filled. Every time the magnet passes along any of the reed-switch point, the reed-switch closes; this is now detected by your micro-controller and action taken accordingly. There are other ways as well:

1)Using a floating mechanism
2)Using a Liquid sensor
3) e.t.c


But all these are intrusive(require contact with medium). Here,i will give you a professional way to implement it. This uses ultrasonic ranging technique. With this scheme, you don't only detect the water level, You can as well tell precisely how fast the water is being pumped and also the exact water height from the base of the Tank. Ultrasonic sensors are positioned at the top of the tank; You use ultrasonic ranging to determine all necessary information. Things you need to know:

1)The Thank Height
1)The Point were the ultrasonic sensor are positioned at the top of the tank

Using simple math, you can get the actual water level,with the Tanks' base as the reference point of measurement.
Normally, you'll need two sensors(Receiver and Transmitter). But there are bi-directional ultrasonic sensors, and this will be best for this design.

As for determining the rate at which the water is being pumped; this is fairly intricate...you'll need to understand how to use ultrasonics in doppler shift velocity estimation. Google is your friend; use it! Detecting presence/absence
of PHCN i would assume is fairly straightforward. Just me 2-Cents!!

usisky:


There are different ways to solve this problem. One way is to use magnetic reed-switches(sensor) arranged vertically across the height of the Tank at various points. A magnet strapped to a floating mechanism aligned close to the reed-switches will indicate current position along the Tank height as it gets filled. Every time the magnet passes along any of the reed-switch point, the reed-switch closes; this is now detected by your micro-controller and action taken accordingly. There are other ways as well:

1)Using a floating mechanism
2)Using a Liquid sensor
3) e.t.c


But all these are intrusive(require contact with medium). Here,i will give you a professional way to implement it. This uses ultrasonic ranging technique. With this scheme, you don't only detect the water level, You can as well tell precisely how fast the water is being pumped and also the exact water height from the base of the Tank. Ultrasonic sensors are positioned at the top of the tank; You use ultrasonic ranging to determine all necessary information. Things you need to know:

1)The Thank Height
1)The Point were the ultrasonic sensor are positioned at the top of the tank

Using simple math, you can get the actual water level,with the Tanks' base as the reference point of measurement.
Normally, you'll need two sensors(Receiver and Transmitter). But there are bi-directional ultrasonic sensors, and this will be best for this design.

As for determining the rate at which the water is being pumped; this is fairly intricate...you'll need to understand how to use ultrasonics in doppler shift velocity estimation. Google is your friend; use it! Detecting presence/absence
of PHCN i would assume is fairly straightforward. Just me 2-Cents!!

usisky: PS: what your friend needs is a flow rate sensor. There are some ultrasonic flow rate sensors too. Google is ur best friend; use it.

schoolboi: I would love 2 know more about this embedded system in terms of pratical.

Dondbuzor: May be dis software ll help!
Proteus 7.0
Try and see if u can get d cracked version. U can start from there!
That's how I started, cheers

Dondbuzor:
Pls I need an answer. Embedded systems and programming which one has more opportunities(profitability) in nigeria.
With reasons plz

Hello buzzor hope you're doing fine.
I am at this stage currently and it's pretty much overwhelming
I am very good at embedded systems and complex electronics (both theoretical and practical) and I have done a number of interesting projects too.
Just that there aren't much opportunities for embedded engineers in Nigeria which is really discouraging. Most people I know that are into web/ app design are doing quite well, and I having this urge to switch to web.

Please I beg to ask, which option did you choose and did it favour you?
Or you could just give me an advise