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added ESP32 IO table to readme.

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Skot Croshere
2022-10-14 13:04:53 -04:00
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readme.md
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@@ -11,6 +11,7 @@ an early-stage experimental bitcoin mining machine. Uses a single Bitmain BM1397
- [HYG SRong](https://www.aliexpress.us/item/3256804436095856.html) -- $4.66 @ QTY 10 w/ shipping
- [BTC Zone](https://www.aliexpress.us/item/3256804305413883.html) -- $6 @ QTY 10 w/ shipping
- [punuo-ic](https://www.aliexpress.us/item/3256804576938680.html) -- $6.16 @ QTY 1 w/ shipping
- Rumor has it these pages don't work outside the US?
- The BM1397 has the same footprint as the BM1387, but a very different pinout.
- It also has two "Modes" that change some of the signal pins around to make chaining easy
@@ -34,6 +35,7 @@ an early-stage experimental bitcoin mining machine. Uses a single Bitmain BM1397
## Connections
![](doc/render.png)
### Board IO
| Pin Name | Description |
| ----------- | ----------- |
| VIN | ASIC VIN - ASIC core voltage. Rumor has it this should be around 1.5V for the the BM1397. This needs more experimentation. |
@@ -46,13 +48,25 @@ an early-stage experimental bitcoin mining machine. Uses a single Bitmain BM1397
| RST | Inverted reset pin to the first BM1397. Unsure how necessary this is. |
| GND | Common ground |
### ESP32 IO
| Signal | ESP32 Pin | Description |
|-----------|-----------|---------------------|
| FAN_TACH | GPIO4 | Fan Speed output |
| TEMP_ALRT | GPIO9 | NCT218 Alert output |
| SCL | GPIO18 | I2C Clock (NCT218) |
| SDA | GPIO19 | I2C Data (NCT218) |
| RX | GPIO2 | BM1397 RO |
| TX | GPIO3 | BM1397 CI |
| RST | GPIO10 | BM1397 NRSTI |
## Goals
- Develop some firmware for the ESP32 to connect to a stratum server/pool over WiFi and get work for the mining ASIC
- Firmware should monitor fan speed
- Firmware should monitor BM1397 core temperature (via NCT218)
- Firmware should tune each BM1397 by adjusting it's core voltage
- Put a high current, low voltage buck regulator on the board that the ESP32 can adjust the voltage of.
- This might be something like the TPS40305. I've made a separate [prototype of that power supply](https://github.com/skot/TPS40305_Supply)
- One way to adjust the output voltage of these power supplies is with a DAC. The regular ESP32 has one, but the ESP32-C3 doesn't :(
- This might be something like the [TPS40305](https://www.ti.com/product/TPS40305). I've made a separate [prototype PCB of that power supply](https://github.com/skot/TPS40305_Supply)
- One way to adjust the output voltage of these power supplies is with a current-output DAC. The [Maxim DS4432](https://datasheets.maximintegrated.com/en/ds/DS4432.pdf) seems purpose built for this kind of thing.
- Develop some software in Rust to getblocktemplate from a bitcoin node and communicate work to a fleet of bitaxes.
- This would be like mining pool software. Maybe [Stratum V2](https://stratumprotocol.org) would work for this?
- add an onboard power sensor so we can set the hashrate (ASIC requency) and therefore current to extract maximum power from a solar panel.