diff --git a/README.md b/README.md index 98461ab..fa5bd34 100644 --- a/README.md +++ b/README.md @@ -114,7 +114,7 @@ Please check the dimensions of your build against the values set in the construc ## ⚙ Electronics -IMPORTANT: If you fabricated PCB verion v1.2 (see version label on the board) you need to drill out a misplaced via on diode D1 that shorts 5V rail to ground (See [repair image](electronics/pcb_v1.2_fix.jpg) ). The problem was fixed in v1.3. +IMPORTANT: If you fabricated PCB version v1.2 (see version label on the board) you need to drill out a misplaced via on diode D1 that shorts 5V rail to ground (See [repair image](electronics/pcb_v1.2_fix.jpg) ). The problem was fixed in v1.3. The electronics are designed in **KiCAD** and only commonly available modules (motor drivers and MCU boards) are used and connected by a simple PCB. No SMD soldering is required to populate the board to make the build extra accessible. For usual winding resistance of your motors, the device should be powered by $${\color{lightgreen} 5V-6V }$$ (2A) to keep current and heating to a reasonable level. @@ -124,6 +124,10 @@ For usual winding resistance of your motors, the device should be powered by $${ Image 2 +## ⚙ Bill of Materials (BOM) + +See the full [BOM here](documentation/bom/bom.md). + ## ⚙ Firmware The firmware is written in C++ and takes some inspiration from the 'SimpleFOC' project. It aims to be streamlined and readable without any extra fuss, focusing on the hardware used in this project. diff --git a/bom.txt b/bom.txt deleted file mode 100644 index 9e21e01..0000000 --- a/bom.txt +++ /dev/null @@ -1,56 +0,0 @@ -(Incomplete - work in progress...) - ---- Mechanics ------------------------------------------------------------------- - - Qty. Name Size Comments - -* 12 Steel ball D=1.25mm (0.05") Precision of G10 or better. - Can be sourced from small ball bearings - -* 1m PU stretch cord D=1mm e.g. 'Stretch Magic' or 'Magic String' - -* 70 Neodym Cylinder Magnet D=3mm h=4mm - -* 1m Brass Pipe OD=2mm ID=1mm - -* 12 M2 Screw M2x12mm, Countersunk - -* 6 M3 Grub Screw M3x4 - ---- Electronics ------------------------------------------------------------------- - - Qty. Name Comments - -* 1 DC-DC Step Down Module 4.75-23V Step-Down Buck Converter Module -* 1 (1N5819) OR (PMEG4010) Diode (either through hole or SMD can be used) -* 1 RaspberryPi Pico 2 - -* 3 MT6835 Magnetic Encoder Module - -* 3 TB6612FNG Driver -* 3 470 μF Electrolytic Capacitor (anything > 100µF will work well) -* 3 10.0 μF Ceramic Capacitor 0603 (optional) - -* 2 4.7k Resistor 0603 (optional) - -* 1 2 Pin Power Header 7.5 mm pitch -* 4 4 Pin Header 2.5 mm pitch -* 1 8 Pin Header 2.0 mm pitch - -* 3 NEMA 17 Stepper Motor (Body length <= 38mm) - ---- 3D Printing ------------------------------------------------------------------ - - Qty. Name Comments - -* 3 WireFlexureMount 0.4mm+ nozzle will probably require post-processing. - -* 3 RubberBandCollet 0.4mm+ nozzle will probably require post-processing. - -* 3 BallJointMount 0.4mm+ nozzle will probably require post-processing. - -* 3 Motor Mount - -* 1 EndEffector - -* 1 Base Block diff --git a/documentation/bom/bom.md b/documentation/bom/bom.md new file mode 100644 index 0000000..dbf7c78 --- /dev/null +++ b/documentation/bom/bom.md @@ -0,0 +1,37 @@ +# Bill of Materials (BOM) + +## Mechanics +| Name | Qty | Description | Comments | Suggested link | Image | +|------|-----|-------------|----------|----------------|-------| +| Steel ball | 12 | Ø1.25 mm (0.05") | Precision G10 or better. Can be sourced from small ball bearings | | +| PU stretch cord | 1 m | Ø1mm | e.g. "Stretch Magic" or "Magic String" | [Aliexpress](https://www.aliexpress.us/item/3256805953910514.html)| ![Pu strech cord](images/PU_StretchCord.png)| +| Neodym Cylinder Magnet | 70 | Ø3mm h=4 mm | N42 Grade | [Ebay Link](https://www.ebay.de/itm/365333642187?var=635110190027)| +| Brass Pipe | 1 m | OD=Ø2mm ID=Ø1 mm | | [Amazon](https://a.co/d/1pRFmtf)| ![Brass Pipe](images/BrassPipe.png)| +| M2 Screw | 12 | M2×12 mm, Countersunk | | | +| M3 Grub Screw | 6 | M3×4 | | | + +## Electronics +| Name | Qty | Description | Comments | Suggested link | Image | +|------|-----|-------------|----------|----------------|-------| +| DC-DC Step Down Module | 1 | 4.75–23 V Step-Down Buck Converter | | [Aliexpress](https://www.aliexpress.us/item/3256806752772875.html)| ![DC-DC Step Down](images/DC_DC-StepDown.png)| +| (1N5819) OR (PMEG4010) | 1 | Diode (through-hole or SMD) | | | +| Raspberry Pi Pico 2 | 1 | Microcontroller board | | | ![Raspberry Pi Pico 2](images/RaspberryPiPico2.png)| +| MT6835 Magnetic Encoder Module | 3 | Magnetic encoder | | [Aliexpress](https://www.aliexpress.us/item/3256808005140674.html)| ![MT6835 Magnetic Encoder Module](images/MT6835.png)| +| TB6612FNG Driver | 3 | | | [Aliexpress](https://www.aliexpress.us/item/3256806060073976.html)| ![TB6612FNG Driver](images/TB6612FNG.png)| +| 470 µF Electrolytic Capacitor | 3 | > 100 µF | anything > 100µF will work well | | +| 10 µF Ceramic Capacitor 0603 | 3 | Optional | | | +| 4.7 k Resistor 0603 | 2 | Optional | | | +| 2 Pin Power Header | 1 | 7.5 mm pitch | | | +| 4 Pin Header | 4 | 2.5 mm pitch | | | +| 8 Pin Header | 1 | 2.0 mm pitch | | | +| NEMA 17 Stepper Motor | 3 | Body ≤ 38 mm | Body length <= 38mm | | + +## 3D Printing +| Name | Qty | Description | Comments | Image | +|------|-----|-------------|----------|-------| +| WireFlexureMount | 3 | | 0.4 mm+ nozzle may require post-processing | ![Wire Flexure Mount](images/WireFlexureMount.png)| +| RubberBandCollet | 3 | | 0.4 mm+ nozzle may require post-processing | ![Rubber Band Collet](images/RubberBandCollet.png)| +| BallJointMount | 3 | | 0.4 mm+ nozzle may require post-processing | ![Ball Joint Mount](images/BallJointMount.png)| +| Motor Mount | 3 | | | ![Motor Mount](images/MotorMount.png)| +| End Effector | 1 | | | ![End Effector](images/EndEffector.png)| +| Base Block | 1 | | | ![Base Block](images/BaseBlock.png)| diff --git a/documentation/bom/images/BallJointMount.png b/documentation/bom/images/BallJointMount.png new file mode 100644 index 0000000..a5d1de2 Binary files /dev/null and b/documentation/bom/images/BallJointMount.png differ diff --git a/documentation/bom/images/BaseBlock.png b/documentation/bom/images/BaseBlock.png new file mode 100644 index 0000000..9f0808d Binary files /dev/null and b/documentation/bom/images/BaseBlock.png differ diff --git a/documentation/bom/images/BrassPipe.png 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