RDB-STPTS-002-DIY
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RDB Build Documentation
Generic pages: | Introduction | Naming convention | Functions description | Listings | RDB_calibrations | RDB_DIY_tips |
Release status: experimental
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| Description | Generic reprap extension for generic development board
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Contents
Features Overview
This board is meant to take GPIO lines (wires,cables,connectors etc) from the development board and provide the support components required for basic operation of a 3d printer.
Board features:
- Pcb size: 160x100mm
- Voltage regulator: 3, fixed
- Support components for: 5 pololu drivers, 4 thermistors, 3 endstops, and 4 switches (low side mosfets) with dedicated drivers and optoisolators
- optimized for DIY: single sided, no bridges, large clearance 0.5mm, min track width 1.5mm, format and traces "bulky" enough so board could be made with any diy technique.
Power input 1, for steppers, dev board, logic level
- this connector supplies steppers, follows a voltage regulator output meant to supply the dev board itself, and another voltage regulator providing the logic level voltage
- input simple reverse polarity protection with high current diode and fuse
- input simple peak voltage burner with zenner and transistor meant to flat off peaks made by steppers switching or bemf
- 12v-32v input voltage (max input voltage depends on the burner zenner voltage, regulators used and stepper drivers max input)
Power input 2, for low side mosfets
- this connector supplies the low side mosfets (switches)
- if this psu is different than the first one, then optoisolators ICs must be equipped in order to provide galvanic isolation of the two grounds
- 12v-16v input voltage (max input voltage depends on hexfet breakdown Vbr, regulators used and most limiting factor, the fet drivers and optoisolators input absolute max)
Stepper drivers
- This board is meant to support pololu carrier stepper drivers, currently using A4988 or DRV8825 stepper driver ICs
- Further documentation on pololu carrier drivers at pololu website and Pololu_stepper_driver_board and other places
- Each driver has a logic input connector with Step/Dir/Enable
- Enable default state (when undriven): driver carriers make enable low, to keep outputs always on. Board reverses this behavior. So outputs will be off by default, and then enable line needs to be actively driven low. This was considered a safer approach.
- Outputs have leds to indicate the state.
Soldering
Source files
| Name | Size (mm) | Comments | Layout pdf | Schematic pdf | Kicad zip | Version | Date |
|---|---|---|---|---|---|---|---|
| RDB-STPTS-002-DIY | 160*100 | ~ | ~ | ~ | source | 002 | 2014 Sept |
