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Anyone want the code for a 4 button version with a buzzer? Just ask me.
I loved the idea though this is NOT a buzzer... so I added one. :)Also I made this for 4 buttons and used an Arduino nano for it. Put it in a wooden enclosure from some scrap wood and added tulip plugs for external switches. Now you can use the switches on the box that are parallel to optional external switches. Both will work.For power I connected a usb cable to the nano an lead that out of the box. Now I can reprogram it and give it powerwithout opning the box..I am considering posting my version as an instructable and if I do I will certainly cradit you for "based on" Thanx 4 the inspiration. (Coming up with good questions for my 5 and 7 years old kids was harder than building this. :))
Most npn transistors will work.
Here are some tinkertoys I have made in the past to reduce breadboard space.
Nicely written and very useful tips. Thanx for taking time off for this from your gps-guided laser cutter. This may aid in building my time-inverted quantum displacement chamber. :-)
And right you are. Never knew the curie temperature of neodymium was that low. But for ferro magnets it is much higher. (>750° C) Not 3 times higher than soldering temperature but almost twice.So I stand corrected and the advice is to use ferro magnets for this project.
My bad: yes DS3231 RTC of course.
The demagnetisation temperature of a magnet is wayyyyyyy beyond soldering temperature (a least 3x higher). No worries there!
Added bonus: the magnet will disappate some of the heat from the soldering iron.
Brilliant idea! Surely will try this out!
A timer is not required if the meter displays the Ah or mAh. That is also a timer-indication: 1000 mAh = 1000 milliamperes for 1 hour.
Nice and very easy way to test them. I made it without the tp-charger board, but using the usb doctor is brilliant.
Very nice idea, nicely made.I might use the idea with a little less leds but with rgb leds and build it with a sunrise feature (connected to an arduino-based alarm clock) I will also add an mp3 player and speakers to the shelf. This way your idea and mine will merge very nicely. Thanks for the inspiration!
Very nice project.Wouldn't be much of a problem to use thru hole components with this design now would it?Also: not really sure how to modify the board for the LM1117 and the L7805...
also very interested in attiny but the absence of i2c is a big issue for me.
My girlfriend has toys too but those cannot be turned down with an added resistor. Sometimes I wish I could add a resistor to the girl herself, but she is irresistable! ;-)
Very nice project. If you use a ds3132 rtc module you can lose the dht11. The only thing you would lose is the humidity sensor: Temperature is also available on the ds3132. Also it would keep much better time than a ds1302 module.
nice! What a coincidence that I have made exactly the same gadget for 4x 18650 batteries!
Nice share. Though it's a very simple hack, it will surely help some frustrated parents. One advice: start LOW (<100 ohm) on the trial resistor values. If there is some volume control on the toy, glueing the volume control stuck at the desired level is a safer option.
You could have said this a little more subtle. If you start low and don't go to high on the resistor value you will not break anything. Especially when there is no volume control on the toy it self. Try at your own risk but start with low resistor values. Volume control on an amplifier is often nothing more than an adjustable resistor.
I love this tutorial! Never knew the Arduino had build in pull up resistors: so much easier, projects with less components. Also love the interupt example: very educational.
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