<p>Notes: Forgot to mention that I hot glued the top lid (original lid
for the 'speaker box'), on top of the boards. I had used the device with
the top uncovered for a month because I hoped I would find a better
choice but after getting tired of the wires detaching and worrying about
the sdcard slot getting wrecked I decided to commit to glueing the lid
on.</p>
<p>The boards are very robust, I dropped them in the snow a few times.
They would stop working but after drying off would function.</p>
<p>I didn't find the datasheet with the resistance values for other
values until after I glued the lid so will have to open it up again or
get into one of the switch lines and do resistor combinations... now
that I know more I think I should be able to control the mp3 player with
one analog output pin from the arduino for all the functions, since it
seems the pin 8 that all the switch resistors lead to detects voltage
levels from the voltage divider created when one of the switches goes to
ground.</p>
<p>The robot is using 4 lines right now for mp3 control. Would be cool
if I could free up 3 more but I don't remember if any of them are
occupying an analogue slot.</p>
<p>No power button! None needed. Pause and unpause via momentary switch.
The charger board can charge from micro usb or usb-c and will protect
your 18650 cell from running flat and damaging itself.</p>
<p>Check out my robots: <a
href="https://bitchute.com/channel/mechatroniac"
class="uri">https://bitchute.com/channel/mechatroniac</a></p>
<p>Post Apocalyptic Robotics Database Entry:<br />
HH000000000<br />
H Hybrid: Denotes some prepurchased or hard to find components<br />
H Human use: For use by biological humans</p>
<p>Tools and supplies</p>
<ul>
<li>multimeter - not strictly required but highly recommended</li>
<li>Soldering iron</li>
<li>solder(thinner solder wire works better for electronics)</li>
<li>wire stripper</li>
<li>hot glue gun</li>
<li>electric or duct tape</li>
<li>side cutters/cutting pliers/aircraft snips</li>
</ul>
<p>Buy:</p>
<ul>
<li><p>1s 18650 charger board<br />
<a href="https://www.aliexpress.us/item/2251832744326141.html"
class="uri">https://www.aliexpress.us/item/2251832744326141.html</a></p></li>
<li><p>GPD2846A TF Card MP3 Decoder Board 2W Amplifier<br />
<a href="https://www.aliexpress.com/item/4000188516180.html"
class="uri">https://www.aliexpress.com/item/4000188516180.html</a><br />
<a href="https://www.aliexpress.com/item/32968306923.html"
class="uri">https://www.aliexpress.com/item/32968306923.html</a></p></li>
</ul>
<p>Find or Buy:</p>
<ul>
<li><p>short lengths of wire</p></li>
<li><p>4 ohm speaker (can be found in old tvs)</p></li>
<li><p>momentary switches(3) - can be found in vcrs, tvs, dvd
players...</p></li>
<li><p>18650 cell</p></li>
<li><p>3.5g weed jar or similar + lid</p></li>
<li><p>larger lid</p></li>
</ul>
<p>(optional)<br />
You should consider getting an arduino or a kit</p>
<ul>
<li><p>Keyestudio Basic Starter Kit V2.0 With UNO R3 Board Or Mega 2560
R3 Board<br />
<a href="https://www.aliexpress.com/item/1005004961819902.html"
class="uri">https://www.aliexpress.com/item/1005004961819902.html</a></p></li>
<li><p>GPD2846A datasheet<br />
<a
href="https://pdf1.alldatasheet.com/datasheet-pdf/view/1132627/ETC2/GPD2846A.html"
class="uri">https://pdf1.alldatasheet.com/datasheet-pdf/view/1132627/ETC2/GPD2846A.html</a><br />
<a
href="https://datasheetspdf.com/pdf-file/949393/Generalplus/GPD2846/1"
class="uri">https://datasheetspdf.com/pdf-file/949393/Generalplus/GPD2846/1</a></p></li>
</ul>
<p><em>Picture 1 - shows the slit in the lid where the sdcard resides. Sdcard and slot are protected from being bumped by the strategically placed, glued lid</em><br />
<a
href="https://hackerpublicradio.org/eps/hpr3809/IMG_20230221_121827127.jpg"><img
src="https://hackerpublicradio.org/eps/hpr3809/IMG_20230221_121827127_thumbnail.jpg"
alt="Picture 1" /></a> <br/><small><small><em>Click the thumbnail to see
the full-sized image</em></small></small></p>
<p><em>Picture 2 - shows charging, microusb cord is coming in from the bottom, LED on charging board illuminates brightly</em><br />
<a
href="https://hackerpublicradio.org/eps/hpr3809/IMG_20230219_180706268.jpg"><img
src="https://hackerpublicradio.org/eps/hpr3809/IMG_20230219_180706268_thumbnail.jpg"
alt="Picture 2" /></a> <br/><small><small><em>Click the thumbnail to see
the full-sized image</em></small></small></p>
<p><em>Picture 3 - shows both boards glued to bottom lid, with the top lid off</em><br />
<a
href="https://hackerpublicradio.org/eps/hpr3809/IMG_20230212_140602078.jpg"><img
src="https://hackerpublicradio.org/eps/hpr3809/IMG_20230212_140602078_thumbnail.jpg"
alt="Picture 3" /></a> <br/><small><small><em>Click the thumbnail to see
the full-sized image</em></small></small></p>
<p><em>Picture 4</em><br />
<a href="https://hackerpublicradio.org/eps/hpr3809/mp3player.png"><img
src="https://hackerpublicradio.org/eps/hpr3809/mp3player_thumbnail.png"
alt="Picture 4" /></a> <br/><small><small><em>Click the thumbnail to see
the full-sized image</em></small></small></p>
