update documentation

README.md

@@ -1,8 +1,9 @@
 # Lemon Pepper Stepper Driver
-Small, all in one hybrid stepper + BLDC driver, designed to mount to the back of NEMA 14/17 size stepper motors. The board supports up to 48V @ 1.5A with a choice of either step-dir, CAN bus, I2C, or USB inputs.
+Small, all in one hybrid stepper + BLDC driver, designed to mount to the back of NEMA 14/17 size stepper motors. The board supports up to 48V @ 1.5A with a choice of either step-dir, CAN bus, I2C, UART or USB input. Additionally, there are 5 GPIO broken out that can be used for a second encoder (AB hardware encoder or I2C), endstops or other general purposes. Current sensing is also included on-board.
 The boards can easily be assembled by JLC and the design has been cost-optimized, coming in at about $20 per board fully assembled (minus connectors, which need to be modified to sit flat on motor back). 
 
 Due to the high pole pair count of stepper motors, a high resolution (21 bit) magnetic encoder is used, supporting both SPI and hardware ABI position encoding. 
-Despite the rather high theoretical performance of this board I think you would need some serious cooling to actually hit the potential 50-70W specs of the parts.
+Despite the rather high theoretical performance of this board I think you would need some serious cooling to actually hit the potential 50-70W specs of the parts. A heatsink has been designed and produced that works well with the board, giving a uniform back profile and small fins for heat dissipation.
-![Photo of PCB](/many.png)
+![Photo of PCB](/many.jpeg)
 ![PCB on motor](/motor.png)
+![Heatsink on motor](/heatsink.jpeg)

hardware/mcu.kicad_sch

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