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readme: update docs on max_i_neg command and heat flow directions

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topquark12 2021-01-25 13:11:55 +08:00
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README.md
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@ -101,7 +101,7 @@ formatted as line-delimited JSON.
| `report mode <off/on>` | Set report mode |
| `pwm` | Show current PWM settings |
| `pwm <0/1> max_i_pos <amp>` | Set PWM duty cycle for **max_i_pos** to *ampere* |
| `pwm <0/1> max_i_neg <amp>` | Set PWM duty cycle for **max_i_neg** to *ampere* |
| `pwm <0/1> max_i_neg <amp>` | Set PWM duty cycle for **max_i_neg** to *- ampere* |
| `pwm <0/1> max_v <volts>` | Set PWM duty cycle for **max_v** to *volt* |
| `pwm <0/1> i_set <amp>` | Disengage PID, set **i_set** DAC to *ampere* |
| `pwm <0/1> pid` | Set PWM to be controlled by PID |
@ -176,9 +176,13 @@ postfilter rate can be tuned with the `postfilter` command.
## Thermo-Electric Cooling (TEC)
- Connect Peltier device 0 to TEC0- and TEC0+.
- Connect Peliter device 1 to TEC1- and TEC1+.
- The GND pin is for shielding not for sinking Peltier currents.
- Connect TEC module device 0 to TEC0- and TEC0+.
- Connect TEC module device 1 to TEC1- and TEC1+.
- The GND pin is for shielding not for sinking TEC module currents.
When using a TEC module with the Thermostat, the Thermostat expects the thermal load (where the thermistor is located) to heat up with a positive software current set point, and cool down with a negative current set point.
Testing heat flow direction with a low set current is recommended before installation of the TEC module.
### Limits
@ -199,6 +203,16 @@ Example: set the maximum voltage of channel 0 to 1.5 V.
pwm 0 max_v 1.5
```
Example: set the maximum negative current of channel 0 to -3 A.
```
pwm 0 max_i_neg 3
```
Example: set the maximum positive current of channel 1 to 3 A.
```
pwm 0 max_i_pos 3
```
### Open-loop mode
To manually control TEC output current, omit the limit parameter of