Introduction: Simplest Solar Watch

Picture of Simplest Solar Watch

Hello everyone , 
I'am proud to say I have reached over 50 subscribers , :-)
I just want to thank all of them for there support  ,
and also want to thank the Instructable Community for making me a pro member ,
so the best way I know to thank everyone is posting one of my latest projects , 

So to start I'll mention the benefits of making your own solar watch ,

first off is its was cheap and simple to make only costed me a couple of dollars ,
second it never needs the battery replaced , and it takes very little time to charge ,
and the other benefit  is no more shopping around for rare battery's that often the stores do not sell , 
and also wanted it to be simple to make so almost anyone could do it , 

Next is how it works , 
well its simple it use's a rechargeable battery and a small solar cell ,
all you have to do is leave it in the sun for hour or two and its ready to go ,

I wanted this to be explained clearly and to try not to have all the steps crammed into just a couple ,
 hence the extra steps to ensure there is enough detail and picture's to follow it ,  

So with that all said lets go make a solar watch

Step 1: Getting What You Need

Picture of Getting What You Need

OK here's a list of somethings you need ,

A Lava led watch ,  I got this from  ebay  this was about 4 dollars , used this kind because I could fit the solar cell neatly into it ,
A Solar led flash light , this to was from ebay , I paid $ 1.00 for it , it has everything you need inside ,
A metal twist tie the kind you use for plastic  lunch bags  ,  why you ask because well need a flat wire for the battery ,
A piece of small wire ,

Gloves , for when using the epoxy .
epoxy , 
Glue gun ,
clear tape , 
electric tape , 
soldering iron / gun ,
and a small flat screwdriver .

Please Not I'm in no way responsible for Damage or any injuries that may happen , 

Now  to get started ,

Step 2: Getting the Watch and Flash Light Apart

Picture of Getting the Watch and Flash Light Apart

So first thing we want to do is take apart the flash light and they pop the back off the watch ,

when you've finished doing that you can start to de-solder the  solar cell and the battery from the circuit board ,
 now the ground of the solar cell is in the upper corner were the led is ,
and the positive is the red wire of coarse ,

then once you have de-soldered the battery and solar cell we can move on to the next step .

Step 3: Fitting the Battery

Picture of Fitting the Battery

Ok so now we have to prepare the battery ,

First thing we want to do is take the plastic cover off the battery ,
the reason for this is the battery has two button cells in it  which is 6 volts ,
 we will only need one of them for are watch because the watch only  use's 3 volts , 
when you have finished doing that will need to take are twist tie and strip each end of it ,
then coil the one end so it fits flat against the bottom of you button battery ,
then unscrew the battery holder on the watch and carefully place the wire and the battery inside ,
then place the battery holder back and screw it into place , 

ok on to the next step .

Step 4: Solder the Connections

Picture of Solder the Connections

OK now were just about done ,

as all ways I like to post a Diagram of were the connects go ,
but I will put it into words as well .

solder the ground to the solar cell that would be the Twist tie wire that is connected to the bottom of your battery ,

now take a piece of wire and solder it to the top side of your battery holder , the top of your holder is the positive connection
once done solder the positive wire to your solar cell ,

ok now take a piece of electric tape and place it over the battery so you don't short out the connections , 

moving on to the finale step

Step 5: Epoxy Time

Picture of Epoxy Time

now to finish off by making a case out of epoxy / resin .
were going for a water proof seal and need it to be strong to protect the solar cell and the components inside , 
That's were the epoxy will come in ,

so start by ,
take your glue gun and glue the solar cell into place ,  then clean the solar cell with a damp cloth so there's no dirt on it ,
when you've done all that take a piece of clear tape and place it over the solar cell ,
then using the glue gun to melt / seal the edges ,

now using your gloves mix some epoxy and carefully spread it over the top and sides of the solar cell and go around the edges ,
to ensure no water can get inside and make sure the top of the solar cell is smooth ,
bumps would be bad because you will feel it  when wearing it ,

Alright  now your finally finished  , note wait up to a hour to dry first , ;-)

Step 6: Testing It and the Specs

Picture of Testing It and the Specs

Before I posted this Instructable ,
I wanted to test the watch out for a couple of days to make sure there's no problems , 

so after letting it charge for a couple of hours ,
tried it out and it works very well better than I expected , 
it has gone for  a couple of days without needing to be charged and takes very little charging , 
it is tough and will take a drop also it is  water proof ,
for the specs ,

charge time 2 to 3 hours ,
run time 2 days and counting , 
over all performance of the watch is very good , 

So I hope you've enjoyed this Instructable Thank you for Viewing .

P.S if you have any questions feel free ask .



efahrenholz (author)2014-03-03

ill admit i thought this was a lame solar powered battery in a watch but you actually have a watch in there. This is clever!

tech savvy (author)efahrenholz2014-03-03

I like your honesty and thanks ,

there are some cheap and useless solar watches out there ,

that's why I tested it and worked the bugs out before posting this project ,

This is a very cool idea and surprisingly cheap and simple!

Thank you , That was what I was going for , :-)

About This Instructable




Bio: I'm a techie and a DIYer , I'v been know to take junk and make it useful again , not to much I can't ... More »
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