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  • donfrench commented on EasyIoT's instructable ESP8266 Door/window Sensor With SMS Alarm3 months ago
    ESP8266 Door/window Sensor With SMS Alarm

    It would be beneficial if you mentioned which two pins you connect the sensor to. I assume that they are whichever GPIO pin you choose and 3V3, but without a circuit diagram or mention in the text, it isn't clear. I found that it is necessary to add a pull-down resistor between the GPIO pin and GND. Otherwise the sensor reads HIGH forever once the switch is closed.

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  • Low Cost Water Flow Sensor and Ambient Display

    What do you reckon is the smallest flow you can reliably detect? The application I have in mind is a leak detector for a vacation home, where a leak might be very small. A gallon a day can do an enormous amount of damage to a home if left unattended for nine months, for example. Any thoughts on this?

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  • donfrench commented on TonesB's instructable ESP8266 WiFi Module for Dummies2 years ago
    ESP8266 WiFi Module for Dummies

    Ah, I apparently misunderstood and did not read the article carefully enough. Thank you for setting me straight.

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  • donfrench commented on TonesB's instructable ESP8266 WiFi Module for Dummies2 years ago
    ESP8266 WiFi Module for Dummies

    Your comment that "there is only one ESP8266 processor but it is found on many different breakout boards" is incorrect. There are seventeen at this point in time. Please read this article for the entire list:https://en.wikipedia.org/wiki/ESP8266

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  • donfrench commented on jenfoxbot's instructable How to Use (and Choose) a Multimeter!2 years ago
    How to Use (and Choose) a Multimeter!

    There are two other features of a multi-meter that are indispensable in my opinion. First is a built-in support on the back so that you can tip the thing up to almost vertical. This is so you can read it when it is impossible to have it directly beneath your eyes. If the meter has a light-emitting display this isn't so important but most don't in my experience. I just bought a DVM that has a back that folds out from the top so it would have been ideal in this respect if they had only put a stop on it to prevent it from falling over. Second is auto-turn off. If you don't have this your batteries will need recharging or replacing much, much sooner because we all forget to turn these things off. Actually, there is a third feature that relates to the second one. The required battery or...

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    There are two other features of a multi-meter that are indispensable in my opinion. First is a built-in support on the back so that you can tip the thing up to almost vertical. This is so you can read it when it is impossible to have it directly beneath your eyes. If the meter has a light-emitting display this isn't so important but most don't in my experience. I just bought a DVM that has a back that folds out from the top so it would have been ideal in this respect if they had only put a stop on it to prevent it from falling over. Second is auto-turn off. If you don't have this your batteries will need recharging or replacing much, much sooner because we all forget to turn these things off. Actually, there is a third feature that relates to the second one. The required battery or batteries should be the kind that are rechargeable. AA's or AAA's or even a standard 9V.The DVM I mentioned in feature one was a fail on all three points. It couldn't stand on its own. It remained on until I manually turn it off. And the required battery is one of those stubby 9V's that don't come in rechargeable form. But I needed one in an emergency and it was only $24.95 at Radio Shack.

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  • donfrench commented on geekrex's instructable SmartPhone Controlled RGB MOOD Light2 years ago
    SmartPhone Controlled RGB MOOD Light

    You should mention that you can not use your iPhone to control this or any other serial Bluetooth device (not talking BLE now). This is because Apple will not allow an iOS app to connect to a serial Bluetooth device without 1) becoming "Made for iPod" certified, a months-long process that costs $20,000 on average; and to qualify you need to pass a credit check that includes giving them your last three years' tax returns! 2) including one of their special encryption chips on your device - that you have to buy from them 3) pay Apple a royalty on every device you sell if you go commercial with your project. All this just to make a product that makes their product more valuable.

    As late as December 2015, Apple did NOT support classic serial bluetooth (SPP, to be technical). You might want to read this thread on the official Apple discussion site: https://discussions.apple.com/thread/7400388?start=0&tstart=0 .I don't think this has changed since last December but if you know differently, please let us know where you got that information. As I said in my comment, BLE is a different matter but this is not BLE.

    It's not? When did they change that policy? I make a commercial product that they would not support and their official communication with me was exactly what I just reported. In fact I went as far as applying for Made For iPod certification but balked when they demanded I supply my tax returns. But that was three years ago so maybe they changed their policies since then. Which app did you download?

    As late as December 2015, Apple did NOT support classic serial bluetooth (SPP, to be technical). You might want to read this thread on the official Apple discussion site: https://discussions.apple.com/thread/7400388?start=0&tstart=0 .I don't think this has changed since last December but if you know differently, please let us know where you got that information. As I said in my comment, BLE is a different matter but this is not BLE.

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