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Recent content by dr pepper

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    Mp3 / bluetooth / fm tuner module IR remote standard

    Well this method doesnt work, the ir remote works but the idea does not. Android phones are inconsistent when playing bluetooth audio, sometimes on connection to bluetooth they'll auto play on connect, others they need pause sending once, others twice, I dont see a way an arduino can power up a...
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    Mp3 / bluetooth / fm tuner module IR remote standard

    I'm having weird things happen, probably phone software issues. The bluetooth audio player powers up, so does the arduino, the latter waits 2 seconds for the player to boot, sends the mode command to put it in bluetooth mode, waits 5 seconds for bluetooth to connect then sends the play/pause...
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    Mp3 / bluetooth / fm tuner module IR remote standard

    Sussed it. The spec for Nec says 8 bit data and 8 bit address, however the raw data has 32 bits. Turns out the remote sends the command inverted then again non inverted, same with the address. I extrapolated from the raw data coming from the remote the actual data, and now using a lib that...
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    Mp3 / bluetooth / fm tuner module IR remote standard

    I used irremote to show me the raw data from each key on the remote, and I wrote those down. However on sending them things dont work, I wonder if theres stuff missing like key up, key down etc. I'll try sendNEC(); and see if that'll work.
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    Mp3 / bluetooth / fm tuner module IR remote standard

    Anyone know what standard one if these cheapo players uses. I want to control the player from an arduino using infra red, pref using a IR library.
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    Mc3361 Fm Ic AFC control problem

    I worked it out by looking at the datasheet, inside the chip the audio out pin has a transistor to the + rail and a current mirror to ground, putting a 4k7 resistor from the audio output to ground now enables the chip to drive the pin from 1v to 4v with the tuning centred on signal at 2.5v...
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    Mc3361 Fm Ic AFC control problem

    Using this chip I threw together an Fm Rx that works well, untill I followed part of a schem from researchgate that depicts a Afc circuit. The demodulated audio out pin is low pass filtered down to 1 hz or so the the Dc is then fed back to a varicap which forms part of the tank circuit, to lock...
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    Reset reason for atmega 32u4

    Thanks I found it, but didnt you mean MCUSR. Arduino IDE recognizes MCUSR and can just be read into a variable, and the 6 causes of a reset can easily be determined. I expected it to be harder somehow.
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    Reset reason for atmega 32u4

    Is there a register within this chip I can read to determine the cause of the reset. I want to determine a power on reset from a brownout reset.
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    Rough & ready power supply for a spectral lamp

    The datasheet rattles on about the lamp having to be in the vertical position. I have a ebay special high voltage generator, not sure what it makes but it produces a 5mm spark so might be enough, to get 22mhz I'd need a spark gap and a tuned circuit with the coil being part of the lampholder...
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    Rough & ready power supply for a spectral lamp

    I'm thinking of using a VSB-2 argon spectral lamp in an ornamental project, the lamp has no electrodes. Are these powered by capacitive coupling via high voltage, or is there some weird way of making them light.
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    Micro generator lipo charger

    I'm not here to argue Mr Klaus. Well it works kinda, last night here we had moderate wind, around 15 to 20 mph and had the setup running. I fiddled with the charging current on the module by replacing the current set resistor with a pot, the magneto made too much voltage at first, however it...
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    Micro generator lipo charger

    You might be right. Some basic testing the generator seems to make 500ma through a load at around 3v, and then the voltage rises with rpm while the current keeps roughly 500ma, so although power increases until the core saturates the current increases less than voltage. Reducing the load makes...
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    Micro generator lipo charger

    I have the modules, they have 2 Ic's, one is a non descript switching reg, its just marked 'UMB' presumably its made by Umb microelectronics. And the other is a Tp4056 lipo charge controller, from its datasheet I can change the charging current. The board has a Usb c socket with the power pin...
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    Micro generator lipo charger

    Thanks for that. After reading your post I thought of power bank chips, and after 1/2 hour of searching I found a module on ebay that is a battery management system and supports 1 amp of charging current, and takes a 5 to 8v charging power input, and it has adaptable charging on the o/p but...

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