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HD44780 Serial LCD Backpack

author: serisman
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2 layer board of 1.60 x 0.45 inches (40.7 x 11.5 mm)
Uploaded: July 09, 2014
Shared: July 09, 2014
Total Price: $3.60

1-wire, 4-bit, using 74HC595 Shift Register

$1.20 each ($3.60 for 3)

Use the LiquidCrystal_SR1W code from the ‘New LiquidCrystal’ Arduino library:

  • https://bitbucket.org/fmalpartida/new-liquidcrystal/src/

Component: [Sizes] Values (description)

  • U1: [SOIC-16N] 74HC595 (the shift register)
  • VR1: [3296W, 3362P (or similar)] 10k (for contrast control)
  • C1: [0805] 0.1uF (decoupling capacitor)
  • C2,C3: [0805] 2.2nF (part of the 1-wire input circuit)
  • D1: [SOD80 (~1206)] LL4148 (or similar) (part of the 1-wire input circuit)
  • Q1: [SOT-23] NPN (~MMBT2222A or similar) or N-Channel (~2N7002 or similar) (used to allow software control of the backlight LED)
  • R1: [0805] 1k-10k (used to limit the current through the base/gate of Q1)
  • R2,R3: [0805] 1.5k (part of the 1-wire input circuit)
  • R4: [1206] ~100 ohm (used to limit the current through the backlight LED)

1-wire, 4-bit, using 74HC595 Shift Register

$1.20 each ($3.60 for 3)

Use the LiquidCrystal_SR1W code from the ‘New LiquidCrystal’ Arduino library:

  • https://bitbucket.org/fmalpartida/new-liquidcrystal/src/

Component: [Sizes] Values (description)

  • U1: [SOIC-16N] 74HC595 (the shift register)
  • VR1: [3296W, 3362P (or similar)] 10k (for contrast control)
  • C1: [0805] 0.1uF (decoupling capacitor)
  • C2,C3: [0805] 2.2nF (part of the 1-wire input circuit)
  • D1: [SOD80 (~1206)] LL4148 (or similar) (part of the 1-wire input circuit)
  • Q1: [SOT-23] NPN (~MMBT2222A or similar) or N-Channel (~2N7002 or similar) (used to allow software control of the backlight LED)
  • R1: [0805] 1k-10k (used to limit the current through the base/gate of Q1)
  • R2,R3: [0805] 1.5k (part of the 1-wire input circuit)
  • R4: [1206] ~100 ohm (used to limit the current through the backlight LED)
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      Hey there! Before ordering, make sure you have all the info you need to complete and use this design. This usually means a component list, and sometimes additional information such as assembly notes, source code, or usage guides.
      Since this is a project designed by a community member, it may contain design errors that prevent it from working as intended. OSH Park cannot place any guarantees about the functionality or correctness of the design.
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