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Author SHA1 Message Date
Stuart Longland
c60e877083
README.md: update regarding move of project 2025-05-30 13:14:51 +10:00
Stuart Longland
037f3a16d6
setpoints: Drop solar to 4V, battery to 12.75V 
Reduce the solar threshold so that we're at the point where the SSR can
work properly.  i.e. we're at first light.

The battery can discharge for an hour or two at this point, which will
give it a break from the charger just before sunrise.  This may trigger
the other charge controller to charge the battery during the day.

Drop the battery voltage just a fraction so we are past the "knee" of
the discharge curve at 12.8V.
 2018-10-01 10:08:46 +10:00
Stuart Longland
fe8520116f
powerctl: Drop solar presence check. 
At night, we probably don't want to just hammer the batteries with 14.4V
all the time.  If we switch to "solar mode", that'll give the batteries
a bit of a break from the charger.
 2018-10-01 10:07:17 +10:00
Stuart Longland
e87ea6a0b8
setpoints: Drop solar voltage threshold. 2018-09-27 08:48:01 +10:00
Stuart Longland
27612b9173
powerctl: Split out core loop functions. 
This just tries to make things a bit more readable by reducing the depth
of indentation, as per guidance in the Linux kernel style documentation.
 2018-09-22 14:38:32 +10:00
Stuart Longland
caf3e27565
Drop UART support. 
Not being used, and bitrotten.
 2018-09-22 14:26:26 +10:00
Stuart Longland
a7c86401e7
powerctl.c: Re-Add LED blinking 
Before when blinking LEDs I just XORed a bit-mask, that turns out to be
unwise as they blinked out of phase which was just annoying, but it is
still useful to have that "flashing" state to draw your attention to a
problem or to indicate a state.

- We use a single 8-bit register to hold things like the blink phase
  (which is XORed each cycle), and whether we have checked the ADCs.
- Temperature LEDs blink when fan is in "kick-start" state.
- Battery voltage LED now has three states:
  - On: battery is above minimum voltage (good)
  - Off: battery is low
  - Blinking: battery is critical (bad)
- In "solar" mode, mains charger LED will blink if we are in the
  "waiting for low voltage timeout" sub-state.
 2018-09-22 14:23:00 +10:00
Stuart Longland
d6f926fae9
powerctl.c, setpoints.h: Tweak the state machine. 
- Re-introduce the "critically low" threshold which kick-starts the
  charger immediately (like the "low" threshold does now).
- Add a charging time so we consider the charger to be "charging" for
  `T_CHARGE_S` seconds, then check to see the battery has reached the
  float voltage.
- Delay starting the charger until the battery has been low for
  `T_LOW_S` seconds to prevent the charger flapping in and out.
- Re-work the state machines so charging and discharging uses the same
  timer.
 2018-09-22 13:50:33 +10:00
Stuart Longland
d33c69e80d
setpoints.h: Fine tune setpoints. 
- Drop the minimum voltage down a touch so we're not flapping the mains
  charger in unnecessarily.

- Halve the boost time so that the sun has a better chance of keeping
  the battery up.
 2018-09-22 12:30:53 +10:00
Stuart Longland
7e9520db3a
setpoints: Tweak solar and battery thresholds. 
Raise battery minimum voltage threshold to account for inaccuracy in the
ADC readings (which can be as much as 500mV).  Lower the solar threshold
so that it doesn't flap when clouds pass over.
 2018-09-17 22:52:13 +10:00
Stuart Longland
3f0aff5a00
powerctl: Switch to mains at sunset. 
Rather than just waiting for the battery to reach rock bottom or for the
solar override to force the mains charger on.
 2018-09-17 22:51:10 +10:00
Stuart Longland
03161f8d8e
powerctl: Re-work controller logic. 2018-09-17 22:51:00 +10:00
Stuart Longland
dd0f371b7c
setpoints: Tweak default set points. 
- Thermal setpoint: the SOIC version of the microcontroller reads a
  little higher than the DIP version, so make it a little more
  forgiving.
- Delta voltage can be a more forgiving too.
 2017-03-19 14:52:57 +10:00
Stuart Longland
723d226399
powerctl: Use ADC units not MV 2017-03-19 13:22:32 +10:00
Stuart Longland
4a87ef25a4
powerctl: Implement V_DELTA_MV checks. 2017-03-19 12:56:02 +10:00
Stuart Longland
87d76972df
setpoints: Define an increment step to provide hysteresis. 
By incrementing the battery voltage on compare, we ensure we are seeing
a steadily increasing voltage.  If we're not seeing that, then we flag
the warning.
 2017-03-19 12:54:25 +10:00
Stuart Longland
112a127c52
Makefile: fix typo 2017-03-19 12:53:53 +10:00
Stuart Longland
a2e2d1162b
Makefile: If setpoint.h{,.diff} matches, just update timestamp 2017-03-19 12:37:22 +10:00
Stuart Longland
8a27a8df8f
powerctl: Don't change warning state in check. 
Doing so causes flapping that is unable to be resolved by timers.
 2017-03-19 12:36:45 +10:00
Stuart Longland
c2e6915996
powerctl: Wait until t_cwarn expiry before clearing timer. 2017-03-19 12:24:13 +10:00
Stuart Longland
403bd5d58f
Makefile: Show differences in setpoints when updated. 2017-03-19 12:23:44 +10:00
Stuart Longland
3969248610
powerctl: In CHARGE_WAIT state, reset if battery improving. 2017-03-19 11:23:57 +10:00
Stuart Longland
dec958e9ca
setpoints: Swap timeouts around. 
Got high and low frequency swapped, whoopsie!
 2017-03-19 11:14:36 +10:00
Stuart Longland
97d4732c6c
powerctl: Implement warning timer. 2017-03-19 10:59:33 +10:00
Stuart Longland
0e58231224
setpoints: Add warning timeout. 
If the charge isn't rising, we should wait before acting on it in case
it is temporary in nature.

It was hoped that the charger delay should be enough, but it seems it
still can flap.  We reset the warning if we see an improvement, or let
the timer expire if we don't.
 2017-03-19 10:57:39 +10:00
Stuart Longland
10cf0c710a
powerctl: Re-locate WARNING LED update. 2017-03-19 10:15:51 +10:00
Stuart Longland
5fe8ce3d74
powerctl: Revert t_adc to being a tick timer. 
Rather than counting seconds, count ticks, so we can set sub-second ADC
samples.
 2017-03-19 09:41:41 +10:00
Stuart Longland
cdb3bb6349
setpoints: Re-name constants to reflect new units, tweak values. 2017-03-19 09:41:23 +10:00
Stuart Longland
a5031f0403
powerctl: Tweak warning LED usage. 
Show a warning when charging and the battery voltage is *not*
increasing.
 2017-03-19 09:28:55 +10:00
Stuart Longland
511309aa74
powerctl: Create one-second timer 
This creates a one-second timing event from the high-frequency timer for
less frequent events so we don't have to keep ticking down larger
numbers.
 2017-03-18 15:44:48 +10:00
Stuart Longland
c29736ca86
powerctl: Fix some debug typos 2017-03-18 15:22:35 +10:00
Stuart Longland
3341fcefdf
Makefile: Pass -DDEBUG if DEBUG=y 2017-03-18 15:22:18 +10:00
Stuart Longland
3db2e03807
powerctl: Re-locate high-voltage threshold check. 
If the charger is doing a bulk charge, it'll likely be dumping high
current into the battery, resulting in a high voltage appearing at the
terminals.

We don't want to disturb this… we want to wait until the charger thinks
it's done, which it signifies by turning off.  We should see the voltage
drop back and continue falling.  If we're above our "high" threshold at
this point, *then* we might consider leaving it off.
 2017-03-18 14:04:12 +10:00
Stuart Longland
312d21c01c
powerctl: Re-write battery charge control logic. 
See doc/flowdiag.png and
https://hackaday.io/project/10529-solar-powered-cloud-computing/log/54762-charge-control-flow-control-diagram
for details on how this new logic is supposed to work.
 2017-03-12 15:47:39 +10:00
Stuart Longland
a427edff38
setpoints: Rename constants for consistency 2017-03-12 15:47:22 +10:00
Stuart Longland
5c57cd27ae
setpoints: Cosmetics 2017-03-12 14:40:20 +10:00
Stuart Longland
29912e0c7c
board: Define timer configuration. 2017-03-12 14:38:18 +10:00
Stuart Longland
82eaf94aef
setpoints: Re-adjust setpoint definitions. 
- Define timeouts in milliseconds for portability
- Define voltages using symbols in design documentation
 2017-03-12 14:33:15 +10:00
Stuart Longland
39ef58f145
doc: Add re-design documentation. 
After some thought, the original code isn't going to do what is needed.
The following image is a re-design of the firmware having re-assessed
the requirements.
 2017-03-11 23:29:57 +10:00
Stuart Longland
301c9a9d43
Lengthen some timeouts. 
We seem to be a bit too impatient waiting for the mains charger to kick
in, and too hasty for the fan.
 2016-11-05 17:04:45 +10:00
Stuart Longland
d29d15308b
Add shutdown delay on "high" threshold. 
We should delay our shutdown in case the charger decides to ramp down
itself.  Otherwise we can get the situation where a smart charger starts
high, tripping the high threshold immediately, leading to the controller
and charger oscillating between on and off.
 2016-11-05 17:04:05 +10:00
Stuart Longland
d91ec8d786
Move setpoint definitions to separate header. 
This will get copied over to setpoints.h, where the developer can
customise them.  If they do so, and I have to change things, the
Makefile will warn them of this.
 2016-09-04 06:57:36 +10:00
Stuart Longland
772d5b9d30
FAN control: Fine-tune minimum PWM 
It appears the minimum PWM is more strongly dependent on battery voltage
than I had planned, it needs to be just a little higher to ensure the
fan keeps turning at low RPM.
 2016-09-04 06:47:28 +10:00
Stuart Longland
e62cbf497a
fan PWM tweaks. 
- Adjust the calculations so that we base our initial PWM at 0 then
  clamp to minimum PWM
- Implement a fan kick-start mode
- Start with fan off so kick-start mode works
 2016-09-04 06:30:52 +10:00
Stuart Longland
882541392f
Initial check-in 2016-09-03 17:31:15 +10:00