lloydwatkin

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• Pins for ST7735 Touchscreen

  @lloydwatkin started

  • 4 comments
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  @allObjects replied
• Pins for ST7735 Touchscreen

  in Electronics • 3 years, 9 months

  

  Thanks @Gordon! Will get back if (really "when") I'm stuck :)

• Pins for ST7735 Touchscreen

  in Electronics • 3 years, 9 months

  

  

  Hi all,

  Complete electronics luddite here. I have the following LCD touchscreen for a project which uses the following chipsets:

  • Screen https://www.espruino.com/ST7735
    
  • Touch https://www.espruino.com/XPT2046
    
    

  I'm just wondering if someone can help me identify the pins and how they map to those on the ST7735 (and if you want to be really helpful how I'd wire these up to an espruino wifi).

  Thanks, Lloyd.

• Physical connection of motor

  in Projects • 5 years, 6 months

  

  Thanks all, sorry didn't get email notifications so didn't pick up.

  Unfortunately there isnt' a local hardware store (I am fairly rural), and the electronics shop in the nearest city shut down a few years ago. Will take a look at mcmaster.com, or take a stab on some amazon cog sets :)

• Physical connection of motor

  @lloydwatkin started

  • 6 comments
  • 2,975 views

  @lloydwatkin replied
• Physical connection of motor

  in Projects • 5 years, 8 months

  

  Hi,

  Not strictly related to espruino, hope its ok :)

  I want to attach this to a cog/something to turn it into a pulley (see my other post from months ago about a chicken door). Thing is there's loads of cheap cog kits on amazon, but they are all for circular shafts, not a flat ended one like this.

  Is there an online shop where I can get bits for the physical attachment of things like this?

  Any help/pointers appreciated, Lloyd.

• Little Stuck with a relay

  @lloydwatkin started

  • 12 comments
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  @Gordon replied
• Little Stuck with a relay

  in Electronics • 5 years, 10 months

  

  Yeah it was all relay side, switch out a couple of wires (maybe use something a bit thicker too), and use the higher torque motor.

  I did originally try to use a servo and a stepper from geek kit from kickstarter but they were non-(kick)starters.

  I've had a look inside a couple of commerical units (mainly because you can see stuff on their install videos and it looks like a geared DC motor (e.g. https://youtu.be/Kw6RZGMiz7I?t=2m22s
  
  )

  As for charging, the commerical units run off 4 AA for a couple of years happily, so the large 4.7v LiPo (4.7v 2700mAh HJ7534100) should go for some time without charging, but that's boring, I was looking at https://www.ebay.co.uk/itm/NEW-Mini-Sola­r-Lipo-Charger-Board-CN3065-Lithium-Batt­ery-Charger-Board-Module/173335088589?_t­rkparms=aid%3D111001%26algo%3DREC.SEED%2­6ao%3D1%26asc%3D20160908105057%26meid%3D­42ddb3fc36d742b49a20773034fd7809%26pid%3­D100675%26rk%3D2%26rkt%3D15%26sd%3D16305­9043652%26itm%3D173335088589&_trksid=p24­81888.c100675.m4236&_trkparms=pageci%3Ab­37bf9ca-6faa-11e8-8bde-74dbd1800b6a%7Cpa­rentrq%3Afd5a852a1630aada0a15920bfffaf3e­8%7Ciid%3A1 and then a small solar panel just to trickle charge it when the sun is around. Its going to be two motor winds a day, and two wifi connections to send a message and then deep sleep so I don't think it'll use much.

  Anyway, whilst I wait for the motor I've got some nesting boxes to build. Thanks for all the help

• Little Stuck with a relay

  in Electronics • 5 years, 10 months

  

  So got it all spinning in each direction. Rigged up a coffee cup lid and connected it to the motor.

  Didn't use my brain and the motor wasn't able to lift the chicken door (<500g) but ignored it, and we'll the wires started smoking, from memory impedance?

  Anyway I've now ordered a higher torque motor which I can just swap in (it can lift up to 2.5kg apparently) https://www.amazon.co.uk/WINOMO-3V-6V-Sh­ort-Shaft-Torque/dp/B010SP427I/ref=redir­_mobile_desktop?_encoding=UTF8&psc=1&ref­_=ya_aw_od_pi

  So will give that a go on Friday. The next step is to get some sort of small solar panel and charge unit, seem them for around £6 (I may need to bug you again Gordon!). Just to keep things topped up.

  Short term I think it'll just be an LDR and sitting outside with my laptop takin g measurements for door opening Vs closing times. Eventually I'd like to link to WiFi, have a minimum opening time of 7am, and then something ~45 minutes after sunset. LDR is cheaper and doesn't involve me doing the WiFi/cat5 to our garden (longer term plan regardless). Oh and to report that the door is open and closed (WiFi could also periodically sync the time).

  Once the motor is working on the door it'll just be two reed switches to ensure door opens and closes at the right point rather than relying on timing which could go wrong, or something could slip (I think commercial systems just rely on time and calibration - maybe good enough, bit reed switches aren't expensive!).

  I'll write up the chicken door at some point. Theres a couple of Arduino examples. But it would be good to get an espruino example shared because it's such a great project and I've done it with very little experience and knowledge (except my JS).

  Thanks!

• Little Stuck with a relay

  in Electronics • 5 years, 10 months

  

  Actually i've found this online using an arduino, looks good, https://drive.google.com/file/d/1fFhEGzO­6kGI7plBqrEAgKL9d_WUagGxj/view, I'll try this.