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Author | SHA1 | Date |
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atse | 9ef1d05a42 | |
atse | 204336aaf3 | |
atse | 0eb1d492e4 | |
atse | bb4f43fe1c | |
atse | 9df0fe406f | |
topquark12 | 5ba74c6d9b |
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@ -106,7 +106,7 @@ formatted as line-delimited JSON.
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| `pwm <0/1> i_set <amp>` | Disengage PID, set fixed output current |
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| `pwm <0/1> pid` | Let output current to be controlled by the PID |
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| `center <0/1> <volt>` | Set the MAX1968 0A-centerpoint to the specified fixed voltage |
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| `center <0/1> vref` | Set the MAX1968 0A-centerpoint to measure from VREF |
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| `center <0/1> vref` | Set the MAX1968 0A-centerpoint to a stable calibrated VREF |
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| `pid` | Show PID configuration |
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| `pid <0/1> target <deg_celsius>` | Set the PID controller target temperature |
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| `pid <0/1> kp <value>` | Set proportional gain |
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@ -184,7 +184,7 @@ postfilter rate can be tuned with the `postfilter` command.
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- Connect TEC module device 1 to TEC1- and TEC1+.
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- The GND pin is for shielding not for sinking TEC module currents.
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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.
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When using a TEC module with the Thermostat, the Thermostat expects the thermal load (where the thermistor is located) to cool down with a positive software current set point, and heat up with a negative current set point.
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Testing heat flow direction with a low set current is recommended before installation of the TEC module.
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@ -1,11 +1,13 @@
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use smoltcp::time::{Duration, Instant};
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use uom::si::{
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f64::{
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ElectricCurrent,
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ElectricPotential,
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ElectricalResistance,
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ThermodynamicTemperature,
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Time,
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},
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electric_current::ampere,
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electric_potential::volt,
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electrical_resistance::ohm,
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thermodynamic_temperature::degree_celsius,
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@ -26,11 +28,10 @@ pub struct ChannelState {
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pub adc_calibration: ad7172::ChannelCalibration,
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pub adc_time: Instant,
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pub adc_interval: Duration,
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/// VREF for the TEC (1.5V)
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pub vref: ElectricPotential,
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/// i_set 0A center point
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pub center: CenterPoint,
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pub dac_value: ElectricPotential,
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pub i_set: ElectricCurrent,
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pub pid_engaged: bool,
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pub pid: pid::Controller,
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pub sh: sh::Parameters,
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@ -44,10 +45,9 @@ impl ChannelState {
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adc_time: Instant::from_secs(0),
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// default: 10 Hz
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adc_interval: Duration::from_millis(100),
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// updated later with Channels.read_vref()
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vref: ElectricPotential::new::<volt>(1.5),
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center: CenterPoint::Vref,
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dac_value: ElectricPotential::new::<volt>(0.0),
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i_set: ElectricCurrent::new::<ampere>(0.0),
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pid_engaged: false,
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pid: pid::Controller::new(pid::Parameters::default()),
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sh: sh::Parameters::default(),
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@ -58,7 +58,6 @@ impl Channels {
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let pwm = pins.pwm;
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let mut channels = Channels { channel0, channel1, adc, pins_adc, pwm };
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for channel in 0..CHANNELS {
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channels.channel_state(channel).vref = channels.read_vref(channel);
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channels.calibrate_dac_value(channel);
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channels.set_i(channel, ElectricCurrent::new::<ampere>(0.0));
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}
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@ -95,13 +94,15 @@ impl Channels {
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})
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}
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/// calculate the TEC i_set centerpoint
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/// get the TEC i_set centerpoint
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pub fn get_center(&mut self, channel: usize) -> ElectricPotential {
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match self.channel_state(channel).center {
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CenterPoint::Vref => {
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let vref = self.read_vref(channel);
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self.channel_state(channel).vref = vref;
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vref
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match channel {
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0 => self.channel0.vref_meas,
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1 => self.channel1.vref_meas,
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_ => unreachable!(),
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}
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},
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CenterPoint::Override(center_point) =>
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ElectricPotential::new::<volt>(center_point.into()),
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@ -115,11 +116,7 @@ impl Channels {
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}
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pub fn get_i(&mut self, channel: usize) -> ElectricCurrent {
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let center_point = self.get_center(channel);
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let r_sense = ElectricalResistance::new::<ohm>(R_SENSE);
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let voltage = self.get_dac(channel);
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let i_tec = (voltage - center_point) / (10.0 * r_sense);
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i_tec
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self.channel_state(channel).i_set
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}
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/// i_set DAC
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@ -135,16 +132,12 @@ impl Channels {
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}
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pub fn set_i(&mut self, channel: usize, i_tec: ElectricCurrent) -> ElectricCurrent {
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let vref_meas = match channel.into() {
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0 => self.channel0.vref_meas,
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1 => self.channel1.vref_meas,
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_ => unreachable!(),
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};
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let center_point = vref_meas;
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let center_point = self.get_center(channel);
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let r_sense = ElectricalResistance::new::<ohm>(R_SENSE);
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let voltage = i_tec * 10.0 * r_sense + center_point;
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let voltage = self.set_dac(channel, voltage);
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let i_tec = (voltage - center_point) / (10.0 * r_sense);
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self.channel_state(channel).i_set = i_tec;
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i_tec
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}
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@ -268,7 +261,7 @@ impl Channels {
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let samples = 50;
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let mut target_voltage = ElectricPotential::new::<volt>(0.0);
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for _ in 0..samples {
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target_voltage = target_voltage + self.get_center(channel);
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target_voltage = target_voltage + self.read_vref(channel);
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}
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target_voltage = target_voltage / samples as f64;
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let mut start_value = 1;
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@ -432,7 +425,6 @@ impl Channels {
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}
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fn report(&mut self, channel: usize) -> Report {
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let vref = self.channel_state(channel).vref;
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let i_set = self.get_i(channel);
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let i_tec = self.read_itec(channel);
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let tec_i = self.get_tec_i(channel);
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@ -449,7 +441,6 @@ impl Channels {
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.map(|temperature| temperature.get::<degree_celsius>()),
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pid_engaged: state.pid_engaged,
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i_set,
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vref,
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dac_value,
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dac_feedback: self.read_dac_feedback(channel),
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i_tec,
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@ -547,7 +538,6 @@ pub struct Report {
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temperature: Option<f64>,
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pid_engaged: bool,
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i_set: ElectricCurrent,
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vref: ElectricPotential,
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dac_value: ElectricPotential,
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dac_feedback: ElectricPotential,
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i_tec: ElectricPotential,
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