Hello. I am a beginner in electronics. I appologize if this is not the place for beginners, but i would really be thankful if someone would help me a little bit with a circuit design. I have placed a photoresistor as a sensor in cheap analog weight scale in order to get signals from the scale by an old mobile phone. I want to put the weight scale under the beehive. The led is above the scale indicator disc, and the photoresistor is beneath the indicator disc. There are holes on every 10kg mark which let the light go through when in right position. The photoresistor is hooked up to a key on phone keyboard, and it should call me since my number is set as a speed dial on a given key. The problem is, i need the signal to the keyboard only a few seconds, but when a LED flashes it, it stays for several hours or even days, and the phone would call me all the time. Weight is changing very slowly. I want something that will send a signal from a photoresistor to the keyboard for a few seconds. It should send a new signal to the keyboard only when the LED flashes it again, not before that. I know that I should learn some more first, and than start a project like this, but I really need this thing. It would be very useful to me since I have 100 beehives, and this device would be a real help. Sure, I have a expensive GSM scale, but a few of this cheap scales would be really great to have. Thanks in advance.
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