add bom, img

2021-06_fab-step-ucbus/fab-step-ucbus-bom.csv

+Part,Value,Device,Package,Description,Digikey PN
+C5,0.1uF,CAP1206,1206,Capacitor,399-4674-1-ND
+C8,0.1uF,CAP1206,1206,Capacitor,
+C2,1uF,CAP1206,1206,Capacitor,445-1423-1-ND
+C4,1uF,CAP1206,1206,Capacitor,
+C7,1uF,CAP1206,1206,Capacitor,
+C10,1uF,CAP1206,1206,Capacitor,
+C1,10uF,CAP1206,1206,Capacitor,490-12425-1-ND
+C3,10uF,CAP1206,1206,Capacitor,
+C6,10uF,CAP1206,1206,Capacitor,
+R7,0R,RESISTOR1206,1206,Resistor,311-0.0ERCT-ND
+R11,0R,RESISTOR1206,1206,Resistor,
+R1,0R100,RESISTOR1206,1206,Resistor,311-0.1ANCT-ND
+R5,0R100,RESISTOR1206,1206,Resistor,
+R4,120R,RESISTOR1206,1206,Resistor,311-100FRCT-ND
+R6,120R,RESISTOR1206,1206,Resistor,
+R8,120R,RESISTOR1206,1206,Resistor,
+R9,120R,RESISTOR1206,1206,Resistor,
+R2,10k,RESISTOR1206,1206,Resistor,311-10.0KFRCT-ND
+R3,10k,RESISTOR1206,1206,Resistor,
+U2,A4950FAB,A4950FAB,SOIC8_PAD_THRU_FAB,2.5A H-Bridge,620-1470-1-ND
+U4,A4950FAB,A4950FAB,SOIC8_PAD_THRU_FAB,2.5A H-Bridge,
+U1,ATSAMD21E18A-AFFAB,ATSAMD21E18A-AFFAB,TQFP-32-FAB,Cortex-M0 Microcontroller,ATSAMD21E18A-AF-ND
+U$1,Green,LED,LED1206,LED,67-1357-1-ND
+U$2,Green,LED,LED1206,LED,
+U3,,REGULATOR_SOT223,SOT223,1A 3v3 Regulator,ZLDO1117G33DICT-ND
+U5,,RS485-ISL83078EMSOP-FAB,8-MSOP-FAB,RS485 Driver,ISL83078EIUZA-ND
+U6,,RS485-ISL83078EMSOP-FAB,8-MSOP-FAB,RS485 Driver,
+X1,USB_1/64,USB_1/64,DX4R005HJ5_64,Micro-B USB Connector,609-4613-1-ND
+J1,,CORTEX_JTAG_DEBUG_SMD,,Cortex Debug Connector,609-3729-ND
+J2,,CONN_05X2SMD_LONGPADS,,"2x5 Header 0.1"" Pitch, Shrouded",ED10527-ND
+S1,,2-8X4-5_SWITCH,,Momentary Switch,CKN10685CT-ND
+S2,,2-8X4-5_SWITCH,,Momentary Switch,
\ No newline at end of file

README.md

-## Fab Stepper Driver
+## Modular Fab Stepper Driver
 
-Fab-Labbable (i.e. easy-to-pcb-mill) design for a networked stepper driver. 
+This is a Fab-Labbable (i.e. easy-to-pcb-mill) design for a networked stepper driver. Check [the dev log](log/fab-step-log.md) for more details.
 
-SAMD21E18 micro, 2x A4950 H-Bridges to drive, UART over RS485 network / bus connection. 
+![motor](log/2021-11-22_fab-step.jpg)
 
-## Status 
-
-**2021 06 15** 
-
-I have the D21 alive and running, and the 2x H-Bridges alive and stepping w/ microstepping via VREFs and a LUT. A previous design used TTL comms and the SPI peripheral, I have elected to re-do with UART over RS485. Those boards are in the mail, so I'll be testing / making-alive next month. I'm also interested in refining an embedded-level motion controller and networked interface. The D21 presents some (mostly RAM limited) programming challenges, and without an FPU I'm curious about how well lookahead will work. 
-
-[dev log](log/fab-step-log.md)
-
-## Images
+This uses the SAMD21E18 microcontroller, 2x A4950 H-Bridges to drive, and is connected to [osap networked controllers](https://gitlab.cba.mit.edu/jakeread/osap) using the [uart-clocked bus data link](https://gitlab.cba.mit.edu/jakeread/ucbus-notes), an RS-485 powered deterministic bus. 
 
 ![route](log/2021-06-19_routed.png)
 ![schem](log/2021-06-19_schem.png)
 
-Slightly older version:
+### Building Fab-Step 
 
-![fab](log/2021-06-15_fab-step.jpg)
+Circuit files are available [here](2021-06_fab-step-ucbus). 
 
 ### BOM 
 
-| Part | PN | Count |
-| --- | --- | --- |
-| SAMD21E18 | ‎ATSAMD21E18A-AU-ND‎ | 1 |
-| 3v3 Reg | ZLDO1117G33DICT-ND | 1 |
-| RS485 Tranciever | ISL3176EIBZ-ND | 1 | 
-| 2x5 Header | 1175-1621-ND‎ | 1 |
-| 2x5 JTAG | 1175-1629-ND or 609-3695-1-ND | 1 |
-| USB Micro B | 609-4613-1-ND | 
-| Reset Button | CKN10685CT-ND | 
-| 0.1uF 1206 | 399-C1206C104K5RAC7800CT-ND |
-| 1uF 1206 | 1276-3091-1-ND |
-| 10uF 1206 | 1276-6736-1-ND |
-| 0R 1206 | 541-4171-1-ND |
-| 100mOhm 1W 1206 | 2037-SCRR1206S1-R100FCT-ND |
-| 120R 1206 | 541-4193-1-ND |
-| 10k 1206 | 541-3983-1-ND |
-| LED 1206 | 160-1403-1-ND | 
\ No newline at end of file
+I have published an online [Bill of Materials, here](https://docs.google.com/spreadsheets/d/e/2PACX-1vS1O6LhY8GtTYtnFfkABpFL04ExAnMShsRPDNRNZeFXVBi_aEPuFjofpvHQqx7KgcQ-_qJOgMHmKk_m/pubhtml) or you can download the [spreadsheet](2021-06_fab-step-ucbus/fab-step-ucbus-bom.xlsx) or [csv](2021-06_fab-step-ucbus/fab-step-ucbus-bom.csv). 
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