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Try loading the charger with a 100 ohm resistor. The voltage should drop, but even if it does remain at 9V you will still be drawing only 90 mA . The charger's output is probably unregulated. For that matter, it's probably inadequately filtered for 50 Hz AC. If you're planning to use it for...
No, unfortunately.
---------- Post added at 21:02 ---------- Previous post was at 20:52 ----------
tpetar has a good idea. use IR to transmit data from the device, and microwaves to power it. antennas are cheaper than photovoltaics, and LEDs are cheaper than transmitters.
An RF signal (it would have to be microwave) strong enough to be rectified so as to charge the battery. The signal could be modulated to input information to the device, including (most importantly) that the transmission is about to pause so that the device can transmit its own data.
Low baud rates tend to be used if the transmission medium is incapable of supporting faster speeds. A higher baud rate means you can transfer more data in the same period of time.
I assumed that since you mentioned an underwater application, water would be the transmission medium.
If you are...
Perhaps send the data in serial, rather than parallel form?
Or, convert the 11 bits to 7 bits and use the Xbee. Using two Xbee's at once wouldn't work, because you'd probably end up communicating with two devices simultaneously.
Thank you for that datasheet. So he's supplying a 5V chip with 12V. Once the internal LEDs were lit, it would probably be the end of it. Just as well they're not grounded!
You say it works great. Does the output of the controller have any effect on the motor? Seems to me with D3 in the circuit, the motor would operate continuously.
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