Merge pull request #42 from nicholaswilde/add-bq27074-ina260

Add bq24074 ina260

.github/workflows/test.yaml

@@ -18,11 +18,8 @@ jobs:
     strategy:
       matrix:
         arduino-platform:
-          - "esp8266:esp8266"
           - "esp32:esp32"
         include:
-          - arduino-platform: "esp8266:esp8266"
-            fqbn: "esp8266:esp8266:huzzah"
           - arduino-platform: "esp32:esp32"
             fqbn: "esp32:esp32:featheresp32"
 

config.h

@@ -2,22 +2,23 @@
 
 // Change these parameters
 #define BAUD_RATE 115200        // baud rate used for Serial console
-#define R1 1000000              // resistor 1 on the voltage divider (Ω)
-#define R2 220000               // resistor 2 on the voltage divider (Ω)
+
+// ThingSpeak fields
 #define FIELD_NO_PERCENTAGE 1   // field number of battery percentage
-#define FIELD_NO_LEVEL 2        // field number of battery level
+#define FIELD_NO_CURRENT 2      // field number of battery level
 #define FIELD_NO_VOLTAGE 3      // field number of battery voltage
+#define FIELD_NO_POWER 4        // field number of battery power
+
 #define SLEEP_TIME 15           // the time the Feather goes into a deep sleep (m)
 #define VOLTAGE_MAX 4.2         // max voltage of lipo battery (V)
 #define VOLTAGE_MIN 2.64        // min voltage of lipo battery (V)
 
-#if defined(ESP8266)
-  #define BUTTON_A  2
-  #define ANALOG_PIN_NO A0      // analog pin number
-#elif defined(ESP32) && !defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
-  #define BUTTON_A 15
-  #define ANALOG_PIN_NO A2     // analog pin number
-#endif
+// Pins
+#define BUTTON_A 15
+#define BUTTON_POWERBOOST 33
+
+const int batteryCapacity = 3000; // Battery capacity in mAh
+const int batteryQuantity = 2;    // Quantity of batteries
 
 // clear the channel if it's a new day.
 bool doClear = false;
@@ -47,6 +48,7 @@ const char * myUserAPIKey = SECRET_USER_APIKEY;
 
 unsigned int localPort = 8888;  // local port to listen for UDP packets
 const int ledPin = LED_BUILTIN;
+const long interval = 1;        // interval for updating discharge loop
 
 #define DELAY_WIFI 5            // delay between samples (s)
 #define DELAY_SCREEN1 2         // delay after screen 1 (s)

docs/README.md

@@ -6,11 +6,11 @@
 
 A solar battery charger to charge lithium ion (li-ion) 18650, 9V, and coin batteries and Ni-MH AA and AAA batteries.
 
-<img src="./assets/images/charger.jpg" width="480">
+<img src="./assets/images/panel-front.jpg" width="480">
 
 <img src="./assets/images/front.jpg" width="480">
 
-<img src="./assets/images/back.jpg" width="480">
+<img src="./assets/images/wires.jpg" width="480">
 
 <img src="./assets/images/thingspeak.png" width="480">
 
@@ -22,31 +22,13 @@ Create [`secrets.h`](https://nicholaswilde.io/solar-battery-charger/configuratio
 
 ```shell
 (
+  sudo apt install python3-serial screen
   brew install arduino-cli
   arduino-cli config init
-  arduino-cli config add board_manager.additional_urls http://arduino.esp8266.com/stable/package_esp8266com_index.json
   arduino-cli config add board_manager.additional_urls https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
   arduino-cli core update-index
-  arduino-cli core install esp8266:esp8266 esp32:esp32
-  arduino-cli lib install ThingSpeak "Adafruit SH110X" Timezone
-)
-```
-
-### ESP8266
-
-```shell
-(
-  arduino-cli compile -b esp8266:esp8266:huzzah .
-  arduino-cli upload -b esp8266:esp8266:huzzah . -p /dev/ttyUSB0 .
-  screen /dev/ttyUSB0 115200
-)
-```
-
-### ESP32
-
-```shell
-(
-  sudo apt install python3-serial
+  arduino-cli core install esp32:esp32
+  arduino-cli lib install ThingSpeak "Adafruit SH110X" "Adafruit INA260 Library" Timezone
   arduino-cli compile -b esp32:esp32:featheresp32 .
   arduino-cli upload -b esp32:esp32:featheresp32 . -p /dev/ttyUSB0 .
   screen /dev/ttyUSB0 115200
@@ -58,15 +40,17 @@ Create [`secrets.h`](https://nicholaswilde.io/solar-battery-charger/configuratio
 Mode: recharge
 
 ```shell
+Mode: recharge
 SSID: MySSID
 Connecting.........
 Connected!
 IP: 192.168.1.77
 Hostname: Feather
 Battery:
- Level: 745
  Percentage: 90%
- Voltage: 4.04V
+ Voltage: 4.04 V
+ Current: 700 mA
+ Power: 2.6 W
 Channel:
  Number: 1642208
  Status: success
@@ -76,10 +60,12 @@ Sleep time: 15m
 Mode: discharge
 
 ```shell
+Mode: discharge
 Battery:
- Level: 745
  Percentage: 90%
- Voltage: 4.04V
+ Voltage: 4.04 V
+ Current: 700 mA
+ Power: 2.6 W
 ```
 
 ---

docs/about.md

@@ -9,6 +9,11 @@
 - Monitor the rate of charging via an online IOT service such as
   [ThingSpeak][1] or [Adafruit IO][2].
 - Learn about solar cells, panels, li-ion, and [Ni-MH batteries][3].
+- Visually monitor the battery voltage, current, and capacity during discharge.
+- Turn on and off the Powerboost 1000 Basic using button `A` on the OLED.
+- Display the current voltage, current, power, and percentage by pressing the
+  `A` button on the OLED without uploading to an online service when the
+  Feather is in a deep sleep.
 
 ## :frame_with_picture: Background
 
@@ -30,23 +35,24 @@ batteries and then use the charged li-ion batteries to charge Ni-MH batteries
 via existing USB chargers. The li-ion batteries are to be disconnectable from
 the solar panel to make more portable to recharge other devices and batteries.
 
-Monitoring is handled by an Adafruit Feather Huzzah (Feather) that has built in
+Monitoring is handled by an Adafruit Feather HUZZAH32 (Feather) that has built in
 wifi support which makes it easy to monitor remotely as well as collect data.
 The board will monitor when the li-ion battery is charging and when charging is
 complete. It can also send notifications when the charge is complete via
 ThingSpeak and IFTTT.
 
 ## :raised_hand: Current Limitations
 
-- As of the time of this writing, charging the li-ion batteries and using the
-  USB port need to happen separately. Therefore, charging the li-ion batteries
-  and charging other things with the USB port can't happen at the same time.
-- The Feather is being powered by the charging li-ion batteries and so the
-  Feather won't turn on unless there is enough juice in the batteries.
-- The Feather is draining the charging li-ion batteries as they are charging.
-- The voltage divider used to measure the battery voltage is constantly
-  draining the battery.
+- The Feather is using some power during the charging of the li-ion batteries.
+- The Feather turns off during high current discharge. See [issue #39][4].
+- I have had issues with two bq24074 chargers where it would suddenly stop
+  charting the batteries. The voltage reading of the `LIPO` pin would
+  oscillate between 0 and 3V. I suspect the IC was damaged due to a too
+  high of voltage being output by the panel. This still needs to be
+  verified.
 
 [1]: https://thingspeak.com/
 [2]: https://io.adafruit.com/
 [3]: https://en.wikipedia.org/wiki/Nickel%E2%80%93metal_hydride_battery
+[4]: https://github.com/nicholaswilde/solar-battery-charger/issues/39
+[5]: https://github.com/nicholaswilde/solar-battery-charger/issues/40