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Electronics factory workers, Cikarang, Indonesia © ILO/Asrian Mirza
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 IGO License. To view a copy of this license, visit creativecommons.org/licenses/by-nc-nd/3.0/igo/deed.en_US.
Erie, PA. August 2022.
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Geeks only should enter Fry’s
Fry's is the mecca for geeks in the silicon valley. Vastly large with an impressive array of items from candy bars, to chips, boards, disks, software, audio/video, media, housewares, you name it. Their prices are good; but, best to watch for your favorite item to be on sale where the prices are quite good.
The downside is that their employees are completely useless. If you have a question or need help--go elsewhere. If you know exactly precisely what you want and are willing to hunt around in the store to find it, it is a good place to go. They could do a much better job of keeping the products neatly arranged.
I prefer the Sunnyvale store and will even drive past the Palo Alto store to go to Sunnyvale. Sunnyvale is larger, cleaner, better organized and less crowded with products and people.
Extracted from a R-392 paratrooper radio set. Of course it was a damaged one, I have several of these sets.
Robot3 has an IR rangefinder, one of my STM32 development boards and an xbee radio running the new ZB firmware. There's also a small motor controller board hidden inside the old battery compartment as well as a 900mAh lipo. The rear two wheels are driven by one motor which is speed controlled by a PWM output from the STM32, while the front two have another motor on a rack and pinion that steers them and is driven by a simple high or low signal from the STM32.
The car can be manually remote controlled over the xbee wireless link but automatically backs away from detected obstacles. Alternatively it can simply drive forwards until it detects an obstacle, then reverse away.
Development slowed once I got the parts for the somewhat more interesting quadcopter UAV.
...with a grill!
I needed to try out my solder paste and wanted to reflow solder these parts, especially the tricky switch and SD card which would be a pain to solder by hand. I don't have an IR oven or a hot plate (or a reflow machine!) but I do have a standard home grill and figured it would be perfect: the fan moves the air, keeping everything the same temperature while the heating elements are overhead and far away enough to heat uniformly over the surface.
It took 5 minutes from turning on until every joint had reflowed (they started reflowing at 4min) and then I left them for a minute out of the grill to cool down. They seem to have soldered perfectly!
I'm still waiting for the parts for the other two PCBs, but the method seems to be great - and loads quicker than doing it by hand!
P.S. yea, it's not a very well regulated temperature, but I don't have a thermometer that could cope so it's pretty difficult to measure
Electronics factory workers, Cikarang, Indonesia © ILO/Asrian Mirza
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 IGO License. To view a copy of this license, visit creativecommons.org/licenses/by-nc-nd/3.0/igo/deed.en_US.
MintyBoost USB battery pack
This one is in a bigger tin than a standard MintyBoost so it can hold four AA cells. That makes it better for charging an iPhone.
Electronics factory workers, Cikarang, Indonesia © ILO/Asrian Mirza
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 IGO License. To view a copy of this license, visit creativecommons.org/licenses/by-nc-nd/3.0/igo/deed.en_US.
Robot3 has an IR rangefinder, one of my STM32 development boards and an xbee radio running the new ZB firmware. There's also a small motor controller board hidden inside the old battery compartment as well as a 900mAh lipo. The rear two wheels are driven by one motor which is speed controlled by a PWM output from the STM32, while the front two have another motor on a rack and pinion that steers them and is driven by a simple high or low signal from the STM32.
The car can be manually remote controlled over the xbee wireless link but automatically backs away from detected obstacles. Alternatively it can simply drive forwards until it detects an obstacle, then reverse away.
Development slowed once I got the parts for the somewhat more interesting quadcopter UAV.
currently have the leds working and being controlled by puredata (http://puredata.info/). Only one of the leds is wired incorrectly, but I think it should be easy enough to resolder (knock on wood).
Something is going wrong in my switch parallel to serial conversion though, need to debug.
I was all excited to get tinkering but couldn't locate my breadboard, which was last seen when I was in college, so with my fingers crossed I headed to Radio Shack. I was pretty sure they would be useless, but not only did they have a selection of breadboards, but also they also had Arduinos in stock. I am amazed.
You can see here, the table is spinning at 33 1/3 RPM as the largest dots appear stationary under the strobe.
A 3.3V 8MHz Arduino Pro connected to an XBee Series 2.5 and a battery. The other Xbee is on the Sparkfun Explorer USB and connected to a Python program that responds to the Arduino's calls.
The long exposure shot lights up the LEDs :o