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I don't understand why you need the DC/DC step up module. You should be able to connect the charger module directly to the battery.
If you've got two 4.2 v cells in series, you're using 8.4 v (at max charge) in a flashlight designed for 4.5 v (with new cells). I'm sure that makes the light a lot brighter, but it may overheat the LED and cause premature failure (as in a few minutes operation instead of years).
The kit list doesn't include the motors.Seems like the robot won't do too much without motors.
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YES, polarity matters. LEDs are Light Emitting Diodes. Diodes conduct electricity on only one direction. Wiring them backwards would produce no light and could damage the diodes.
"diaipates"? what? Maybe you meant dissipates.
Um, look at the post again. He's using the car charge to convert the 9V to 5V.
You're a science teacher? Better brush up on your electronics. The phone wants 5 volts, not 12. The car charger changes the car's 12 volts (actually 14.4 in most cases) to 5 volts. The car charger is a drop-down voltage regulator. It will work on any voltage of about 7 volts up to maybe 15 or 16 (or higher) depending on the actual design of the regulator. Think about it. You can charge a phone from a USB port on a computer. The USB output voltage is 5 volts. (BTW, I'm a retired electronics engineer with over 40 years of electronics design experience.)
Radio Shack? They're out of business. Went bankrupt.
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I really want to try this, but need to come up with something I want to put on a wood plaque. Hmm. Maybe I'll thing of something to do with my college alma mater. Thanks for the idea!
Can you still capture JPG format after the upgrade, or is it always RAW?
Great project and great video. Wish I could work as fast as you do. ;-) I'm gonna check out your other projects. Thanks for posting,
Old photographer's trick, but probably a lot of younger folks haven't seen it. Good job!
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Here's another idea to possibly improve the design: use angle brackets cut from 2x6 or 2x8 lumber to support the uprights (cross-hatched in the attached drawing). This makes a very strong assembly.
It appears from the photos that the "electrical tube" is conduit. There are two types of electrical conduit: steel and plastic. It appears from the photos that Neil used plastic. If you use steel, make very sure that none of the electrical contacts touch the conduit. It is steel, which is a very good conductor of electricity.
Lotta work, but nice dump cart. Good job!
Get idea. I hate waiting for the wood to soak.
I'm sure that works well on a 20" bike as shown in the photos, but I think a full-size adult bike would fall over. Having the slot for the wheel 1/4" wider than the tire would allow a full-size bike to lean over enough that it would probably fall. Just basing this on my experience with other bike stands similar to this. However, making the slot only 1/16 to 1/8" wider than the tire might work.
I have a Grandstand that works very well on adult bikes. Where I live (Oklahoma), the cost of the wood (if I used hardwood) would almost be as much as the Grandstand at Amazon.https://www.amazon.com/gearup-Grand-Stand-Single-Floor/dp/B0007917D8
Cell phone adapter for tripod available on ebay for $1.http://www.ebay.com/itm/like/201605286751?lpid=82&chn=ps&ul_noapp=true
Ever heard of a photographer's tripod? Much easier to carry around if you get one of the smaller ones. Then just figure out a way to make it hold your phone if you prefer that to a real camera. Shouldn't be that hard.
How does this launch a rocket? I don't get it.
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He should have tried it before posting this. As TRLcam points out, it won't work with 5V input. Put two solar panels in series (10 V output) and it should work just fine. Or, find a solar panel with 9-12 V output.However, if the solar panel truly puts out 5V, you could just connect it's output to a USB jack. No regulator needed. Hmm.
He should have tried it before posting this. As TRLcam points out, it won't work with 5V input. Put two solar panels in series (10 V output) and it should work just fine. Or, find a solar panel with 9-12 V output.However, if the solar panel truly puts out 5V, you could just connect it's output to a SUB jack. No regulator needed. Hmm.
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