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Finally, after a long time since I started this thread, I am finished.
Here is a video of it, enjoy.
https://www.youtube.com/watch?v=XcxeJvzYAAw&feature=youtu.be
J
Just realized that these devices are REALLY small! Not something to prototype with unless you are an ant! 2mm width is not much at all! How do you solve these kind of problems?
Hi,
I'm asking this forum in order to solve a little electrical engineering problem of mine.
I have a PIC18F14K50 which requires a ~2-5.5V supply. My battery powerunit provides 7.5V.
So, it is easy to reduce the voltage by a couple of diodes, however, at the low currents, the diodes only...
Hi,
I have a quick question I didn't find the answer to on the internet, nor in the documentation.
I have a PIC 18f14k50 up and running. To my big surprise, when I disconnected Pin1 (Vdd), the unit kept running. Obviously from the power of one of the I/O ports configured as Input (Pin9 to be...
I have a PIR detector in my office that controls the light. Sometimes it doesn't detect me, so I consider building a device to constantly trigger it.
Do you have any idea on how to activly trigger a PIR detector? It is my understanding that they are tuned for 7-14 micrometer wavelength, but...
Yes, that is close to the setup I have, except that I can't use 5v. In that case it shuts down. And BTW, do you really need the 10K resistors in series with the TX, RX? I don't have that, and it works just fine.
JF
An update on my project:
I finally got it working. I learned two important things:
1) Siemens phones shuts automatically down if the voltage is too high: > ~4v
2) In order for a Siemens C65 to accept data, the CTS (pin 5) need to be shorted to ground.
This is my current setup:
Still, there...
Yes, you are absolutely right! I confirmed it yesterday by using putty with a serial-data cable. Further, I also attached my scope to the datawires which verified that the protocol was ~3V TTL, idle high.
I managed to send a lot of different commnds through putty using the data cable, and got...
I belive Fortuna doesn't smile to me on this project! As I described earlier, my first Siemens phone I bought was "locked", with no simple way of unlocking it. So I bougt a new one, Siemens C65. However, now I start to wonder wether this phone doesn't use regular TTL(?) logic on its TX/RX...
Hi,
I bought a Siemens C45 phone on ebay for this project, and received it today. Now I believe that I have made a rookie mistake. It is "locked" 8-O ,seller didn't mention it. My mistake for not asking of course...
Does anybody know how to unlock that model?
Searched the net without...
- Startup time is not a huge issue. Yes, I agree that if the "burglar" knows the system, it is easy to deactivate. However, this is about protecting a cellar with some expensive bikes. Most likely burglar will be some drugie/criminal with little suspicion about a GSM-alarm system there. Even...
I was looking at this link **broken link removed** , which claims less than 10 microAmps! (how do thay do it?) With a batterysource of just 500mAh @3V this would power such a device for 500/0.01 = 50.000 hours?! Seems crazy to me...
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