2 layers82 × 81 mm
2 layers100 × 100 mm
Flipdot H Bridge
comakingspace/FlipDotDisplay3They were bought at the Makerfaire Hannover 2016.
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 76
- Nets
- 160
- Pads
- 568
- Tracks, vias
- 1,432, 315
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 3 Sep 2017
- Updated
- 6 Jan 2019
Overview
Flipdot H Bridge is an open-source printed circuit board by comakingspace, from the comakingspace/FlipDotDisplay repository on GitHub. It is a 2-layer board of 100 × 100 mm with 76 parts on 160 nets, routed with 1,432 tracks and 315 vias.
It is built around the ATMEGA328P-PU, L293D and 74HC595, with the L7805 among its other parts. Its parts include 28 ICs, 8 capacitors, 7 resistors, 5 connectors and 3 diodes. It belongs with the interfaces and adapters boards and the ESP8266 and AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
L293D
DIP-16-40℃~+150℃ 1.2A 2 4.5V~36V 4mA 600mA DIP-16 Brushed DC Motor Drivers ROHSSTMicroelectronicsStepper Motor Driver
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdFlipDotDisplay
3 old flip dot displays which need some work to get up and running.
They were bought at the Makerfaire Hannover 2016.
Hardware design is made in KiCAD 4.
Function
A dot on the display is switched by magnetising an inductor, which causes the colored dot (with a small magnet embedded) to change the orientation. Because the core of the inductor stays magnetized the state of the dot is stable even without being powered.
The inductors of the pixels are hooked up in an array with 24x16. Each column is connected to a single pin of the connector and each row has two inputs; one for positive voltage and one for negative (see FlipDotSchematic). By applying a voltage to a row and a column the corresponding pixel is flipped depending on the current flow direction. The original driver probably used two different power rails and sets of transistors to change the direction of the dot.
The new driver will use a half-bridge configuration on each input to select the current flow direction.
ICs
- Half-bridge driver ICs: L293D
- Shift registers for output : SN74HC595
- Controller: Atmega328p (communicates via serial with the ESP8266)
- Interface for network: ESP8266 (Wemos D1 mini)
Features
- Adafruit GFX library implementation
- MQTT string scroll text
ToDo
- Pull tweets and display them (direct Hex code or text)
- Binary via MQTT
- more ?
Parts
76| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | L293D | Housings_DIP:DIP-16_W7.62mm_Socket | U3, U10, U11, U12, U14, U15, U16, U17, U18, U19, U21, U22, U23, U24, U25, U26 +4 |
| 5 | 74HC595 | Housings_DIP:DIP-16_W7.62mm_Socket | U1, U2, U7, U8, U13 |
| 3 | 1.5K | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R3, R4, R5 |
| 3 | 100nF | Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C5, C8 |
| 2 | 22p | Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C6, C7 |
| 2 | CONN_02X08 | Pin_Headers:Pin_Header_Straight_2x08_Pitch2.54mm | P2, P3 |
| 1 | 0.33uF | Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C3 |
| 1 | 10k | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R6 |
| 1 | 10uF | Capacitors_THT:CP_Radial_D6.3mm_P2.50mm | C2 |
| 1 | 1M | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R7 |
| 1 | 1k | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R1 |
| 1 | 1uF | Capacitors_THT:CP_Radial_D6.3mm_P2.50mm | C4 |
| 1 | 2k | Resistors_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R2 |
| 1 | ATMEGA328P-PU | Housings_DIP:DIP-28_W7.62mm_Socket | U28 |
| 1 | Barrel_Jack | Connectors:BARREL_JACK | J1 |
| 1 | CONN_02X03 | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | P4 |
| 1 | CONN_02X13 | Pin_Headers:Pin_Header_Straight_2x12_Pitch2.54mm | P1 |
| 1 | Crystal | Crystals:Crystal_HC49-4H_Vertical | Y1 |
| 1 | ESP8266_D1_Mini | FDD_footprint:ESP8266_D1_Mini_cropped | U20 |
| 1 | L7805 | TO_SOT_Packages_THT:TO-220_Vertical | U27 |
| 1 | LOGO | FDD_footprint:FDD_Icon | G*** |
| 1 | Led_Green | LEDs:LED_D3.0mm | D1 |
| 1 | Led_Red | LEDs:LED_D3.0mm | D3 |
| 1 | Led_Yellow | LEDs:LED_D3.0mm | D2 |
| 1 | SW_Push | Buttons_Switches_THT:SW_PUSH_6mm | SW1 |
The 54 most common of 76 parts.
Questions
How big is the Flipdot H Bridge PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Flipdot H Bridge use?
76 parts, built around the ATMEGA328P-PU, L293D, 74HC595 and L7805. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Flipdot H Bridge KiCad files?
From the comakingspace/FlipDotDisplay repository on GitHub, at the commit this page was made from: the board is Schematics_H-Bridge/Flipdot_H-Bridge.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flipdot H Bridge design in my own project?
Its repository states no licence, so its author keeps all rights: ask comakingspace before reusing the design.
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