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Energy Harvesting Design Challenge
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Energy Harvesting Design Challenge
Blog Building and debugging my harvester - Part 4
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Engagement
  • Author Author: vsluiter
  • Date Created: 10 Jul 2013 10:43 PM Date Created
  • Views 76 views
  • Likes 1 like
  • Comments 1 comment
  • low_power
  • wuerth
  • 32_bit
  • linear
  • lcd_display
  • energy_harvesting
  • efm32
  • energy_micro
  • energy_harvesting_challenge
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Building and debugging my harvester - Part 4

vsluiter
vsluiter
10 Jul 2013

 

My LCD screen is working!

Great, great, great.... I'm so happy this is starting to work well!

I don't have much time explaining what I did, but I must give credits to EnergyMicro (again) for their outstanding documentation and code library. Last weekend, while not having any hardware, I dug through AN0057 (EFM32 Segment LCD), and the description of what needs to be done to driver your own display, in combination with the source code is very good.  I didn't fully grasp all concepts last weekend, but now, with some hardware, I was able to get the screen running within an evening. Very happy with that, I can just send an integer to the screen, and with a bit of tweaking it displays all numbers from -9 to 199. Cool!

For those interested:here is the code, most modifications are in segmentlcdconfig.h

Powering the device

Because I don't want to keep a boiling pot of water next to me all the time, I'm now powering from a power supply. Because the needed input voltages are so low, I just used a 100Ohm/15Ohm resistor divider to power the device. Not very efficient (most power is dissipated in resistor between Vin and GND), but at least I now have fine control over the input voltage!

Anonymous
  • DAB
    DAB over 8 years ago

    Good job Victor,

     

    It looks like you are on a roll to the finish.

     

    DAB

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