.github/workflows/b-parasite.yml

@@ -86,7 +86,7 @@ jobs:
           sample-dir: code/nrf-connect/samples/ble
           board: bparasite_${{ matrix.soc }}
           revision: ${{ matrix.revision }}
-          cmake-extra: -DCONFIG_PRST_BLE_ENCODING_BTHOME_V2=y -DCONFIG_PRST_SLEEP_DURATION_MSEC=1000 -DCONFIG_PRSTLIB_LOG_LEVEL_DBG=y
+          cmake-extra: -DCONFIG_PRST_BLE_ENCODING_BTHOME_V2=y -DCONFIG_PRST_SLEEP_DURATION_SEC=1 -DCONFIG_PRSTLIB_LOG_LEVEL_DBG=y
           output-bin: ble_${{ matrix.soc }}_${{ matrix.revision }}_debug.hex
 
   build-zigbee:

README.md

@@ -10,7 +10,7 @@ b-parasite is an open source soil moisture and ambient temperature/humidity/ligh
 # Features
 * Capacitive Soil moisture sensor - see [this blog post](https://rbaron.net/blog/2021/04/05/How-capacitive-soil-moisture-sensors-work.html), [this Twitter thread](https://twitter.com/rbaron_/status/1367182806368071685), and [this post](https://wemakethings.net/2012/09/26/capacitance_measurement/) for nice resources on how they work
 * Air temperature and humidity sensor using a [Sensirion's SHTC3](https://www.sensirion.com/en/environmental-sensors/humidity-sensors/digital-humidity-sensor-shtc3-our-new-standard-for-consumer-electronics/)
-* Light sensor using an [ALS-PT19](https://en.everlight.com/wp-content/plugins/ItemRelationship/product_files/pdf/ALS-PT19-315C-L177-TR8_V8.pdf) phototransistor
+* Light sensor using an [ALS-PT19](https://everlighteurope.com/ambient-light-sensors/7/ALSPT19315CL177TR8.html) phototransistor
 * Powered by a common CR2032 coin cell, potentially for over two years
 * Support for [nRF52840](https://www.nordicsemi.com/products/nrf52840) and [nRF52833](https://www.nordicsemi.com/products/nrf52833) modules
 * Open hardware and open source design
@@ -49,12 +49,6 @@ We have three different 3D-printable cases:
 1. Original snap-on case - [case/Top.stl](./case/Top.stl), [case/Bottom.stl](./case/Bottom.stl)
 2. High airflow - [case/b_parasite_case_high_airflow.stl](./case/b_parasite_case_high_airflow.stl)
 3. Mushroom-style - available on [Printables](https://www.printables.com/model/456571-mushroomcap-for-b-parasite-soil-moisture-sensor)
-4. b-parasite Hat - available on [Printables](https://www.printables.com/model/901220-waterproof-case-for-b-parasite-soil-moisture-air-s)
-
-# Accessories
-
-Designs and hardware to help you, when building your own:
-1. Desk holder for b-parasites [Printables](https://www.printables.com/de/model/566974-b-parasite-holder)
 
 # License
 The hardware and associated design files are released under the [Creative Commons CC BY-SA 4.0 license](https://creativecommons.org/licenses/by-sa/4.0/).

code/nrf-connect/prstlib/boards/arm/bparasite_nrf52833/bparasite_nrf52833.dts

@@ -139,6 +139,7 @@
 
 
 &flash0 {
+
 	partitions {
 		compatible = "fixed-partitions";
 		#address-cells = <1>;
@@ -146,23 +147,33 @@
 
 		boot_partition: partition@0 {
 			label = "mcuboot";
-			reg = <0x000000000 0xC000>;
+			reg = <0x00000000 0x0000C000>;
 		};
 		slot0_partition: partition@c000 {
 			label = "image-0";
-			reg = <0x0000C000 0x32000>;
+			reg = <0x0000C000 0x00067000>;
 		};
-		slot1_partition: partition@3e000 {
+		slot1_partition: partition@73000 {
 			label = "image-1";
-			reg = <0x0003E000 0x32000>;
+			reg = <0x00073000 0x00067000>;
 		};
-		scratch_partition: partition@70000 {
+		scratch_partition: partition@da000 {
 			label = "image-scratch";
-			reg = <0x00070000 0xA000>;
+			reg = <0x000da000 0x0001e000>;
 		};
-		storage_partition: partition@7a000 {
+
+		/*
+		 * The flash starting at 0x000f8000 and ending at
+		 * 0x000fffff is reserved for use by the application.
+		 */
+
+		/*
+		 * Storage partition will be used by FCB/LittleFS/NVS
+		 * if enabled.
+		 */
+		storage_partition: partition@f8000 {
 			label = "storage";
-			reg = <0x0007A000 0x00006000>;
+			reg = <0x000f8000 0x00008000>;
 		};
 	};
-};
+};

code/nrf-connect/prstlib/src/adc.c

@@ -108,7 +108,6 @@ static int read_adc_spec(const struct adc_dt_spec* spec, prst_adc_read_t* out) {
 
   int32_t val_mv = buf;
   RET_IF_ERR(adc_raw_to_millivolts_dt(spec, &val_mv));
-  val_mv = MAX(0, val_mv);
 
   out->raw = buf;
   out->millivolts = val_mv;

code/nrf-connect/prstlib/src/sensors.c

@@ -16,9 +16,10 @@ int prst_sensors_read_all(prst_sensors_t *sensors) {
 
   LOG_DBG("Batt: %d mV (%.2f%%)", sensors->batt.adc_read.millivolts,
           100 * sensors->batt.percentage);
-  LOG_DBG("Soil: %.0f %%", 100 * sensors->soil.percentage);
+  LOG_DBG("Soil: %.0f %% (%d mV)", 100 * sensors->soil.percentage,
+          sensors->soil.adc_read.millivolts);
   LOG_DBG("Photo: %u lx (%d mV)", sensors->photo.brightness,
-          sensors->photo.adc_read.millivolts);
+          sensors->soil.adc_read.millivolts);
   LOG_DBG("Temp: %f oC", sensors->shtc3.temp_c);
   LOG_DBG("Humi: %.0f %%", 100 * sensors->shtc3.rel_humi);
   LOG_DBG("--------------------------------------------------");

code/nrf-connect/samples/ble/Kconfig

@@ -2,13 +2,13 @@
 source "Kconfig.zephyr"
 rsource "../../prstlib/Kconfig"
 
-config PRST_SLEEP_DURATION_MSEC
+config PRST_SLEEP_DURATION_SEC
-	int "Sleep duration in milliseconds"
+	int "Sleep duration in seconds"
-	default 600000
+	default 600
 
-config PRST_BLE_ADV_DURATION_MSEC
+config PRST_BLE_ADV_DURATION_SEC
-	int "Advertising duration in milliseconds"
+	int "Advertising duration in seconds"
-	default 1000
+	default 1
 
 config PRST_BLE_MIN_ADV_INTERVAL
 	int "Minimum advertising interval in milliseconds"

code/nrf-connect/samples/ble/README.md

@@ -1,5 +1,5 @@
 # Bluetooth Low Energy (BLE)
-In this sample, b-parasite sensors are periodically read and broadcast using Bluetooth Low Energy (BLE) dvertising packets.
+In this saple, b-parasite sensors are periodically read and broadcast using Bluetooth Low Energy (BLE) dvertising packets.
 
 ## Configuration
 Available configurations and their default values are in [`Kconfig`](./Kconfig). They are set in [`prj.conf`](./prj.conf). Here are some notable examples.
@@ -8,7 +8,7 @@ Available configurations and their default values are in [`Kconfig`](./Kconfig).
 To save energy, the board spends most of the time in a "deep sleep" state, in which most peripherals and radio are completely turned off. The period of sleep is controlled by the `PRST_SLEEP_DURATION_SEC` config.
 
 ### Advertising Duration
-When it wakes up, the sample reads all sensors and keep broadcasting advertising packets for `PRST_BLE_ADV_DURATION_MSEC` before going back to sleep.
+When it wakes up, the sample reads all sensors and keep broadcasting advertising packets for `PRST_BLE_ADV_DURATION_SEC` before going back to sleep.
 
 ### Advertising Packet Encoding
 There are different ways to encode the sensor data in a BLE advertising packet.
@@ -52,4 +52,4 @@ If for example we lower the connection interval to the SDK defaults (`[100, 150]
 
 ![Broadcasting with 100ms current consumption](./media/power-profile/broadcasting-100.png)
 
-With a `200 mAh` CR2032 battery, we can use [this spreadsheet](https://docs.google.com/spreadsheets/d/157JQiX20bGkTrlbvWbWRrs_WViL3MgVZffSCWRR7uAI/edit#gid=0) to estimate the battery life to over two years. Note that this is a simplified model and results in practice may vary.
+With a `200 mAh` CR2032 battery, we can use [this spreadsheet](https://docs.google.com/spreadsheets/d/157JQiX20bGkTrlbvWbWRrs_WViL3MgVZffSCWRR7uAI/edit#gid=0) to estimate the battery life to over two years. Note that this is a simplified model and results in practice may vary.

code/nrf-connect/samples/ble/prj.conf

@@ -21,7 +21,7 @@ CONFIG_ASSERT=y
 
 # Application config - see all options in Kconfig.
 # CONFIG_PRST_BLE_ENCODING_BTHOME_V2=y
-# CONFIG_PRST_SLEEP_DURATION_MSEC=1000
+# CONFIG_PRST_SLEEP_DURATION_SEC=1
 
 # prstlib config - ser all options in prstlib/Kconfig.
 # CONFIG_PRSTLIB_LOG_LEVEL_DBG=y

code/nrf-connect/samples/ble/src/encoding.c

@@ -104,36 +104,33 @@ int prst_ble_encode_service_data(const prst_sensors_t* sensors,
   out[4] = temp_val & 0xff;
   out[5] = temp_val >> 8;
   // Humidity.
-  out[6] = 0x2E;
+  out[6] = 0x03;
-  // Value. Factor 1 over 100%.
+  // Value. Factor 0.01, over 100%.
-  uint8_t humi_val = 100 * sensors->shtc3.rel_humi + 0.5f;
+  uint16_t humi_val = 10000 * sensors->shtc3.rel_humi;
-  out[7] = humi_val;
+  out[7] = humi_val & 0xff;
+  out[8] = humi_val >> 8;
   // Illuminance.
-  out[8] = 0x05;
+  out[9] = 0x05;
   // Value. Factor of 0.01.
   uint32_t lux_val = sensors->photo.brightness * 100;
-  out[9] = lux_val & 0xff;
+  out[10] = lux_val & 0xff;
-  out[10] = (lux_val >> 8) & 0xff;
+  out[11] = (lux_val >> 8) & 0xff;
-  out[11] = (lux_val >> 16) & 0xff;
+  out[12] = (lux_val >> 16) & 0xff;
   // Battery voltage.
-  out[12] = 0x0c;
+  out[13] = 0x0c;
   // Value. Factor of 0.001.
   uint16_t batt_val = sensors->batt.adc_read.millivolts;
-  out[13] = batt_val & 0xff;
+  out[14] = batt_val & 0xff;
-  out[14] = batt_val >> 8;
+  out[15] = batt_val >> 8;
   // Soil moisture.
-  out[15] = 0x2F;
+  out[16] = 0x14;
-  // Factor of 1 over 100%
+  // Factor of 0.01, so we need to multiply our the value in 100% by 1/0.01 = 100.
-  uint8_t soil_val = 100 * sensors->soil.percentage + 0.5f;
+  uint16_t soil_val = 10000 * sensors->soil.percentage;
-  out[16] = soil_val;
+  out[17] = soil_val & 0xff;
-  // Battery percentage.
+  out[18] = soil_val >> 8;
-  out[17] = 0x01;
-  // Value. Factor 1 over 100%
-  uint8_t batt_percentage_val = 100 * sensors->batt.percentage + 0.5f;
-  out[18] = batt_percentage_val;
 
 #endif  // Encoding protocols
 
   LOG_HEXDUMP_DBG(out, out_len, "Encoded BLE adv: ");
   return 0;
-}
+}

code/nrf-connect/samples/ble/src/main.c

@@ -26,7 +26,7 @@ static int prst_loop(prst_sensors_t *sensors) {
   RET_IF_ERR(prst_sensors_read_all(sensors));
   RET_IF_ERR(prst_ble_adv_set_data(sensors));
   RET_IF_ERR(prst_ble_adv_start());
-  k_msleep(CONFIG_PRST_BLE_ADV_DURATION_MSEC);
+  k_sleep(K_SECONDS(CONFIG_PRST_BLE_ADV_DURATION_SEC));
   RET_IF_ERR(prst_ble_adv_stop());
   return 0;
 }
@@ -37,6 +37,6 @@ int main(void) {
   prst_sensors_t sensors;
   while (true) {
     __ASSERT(!prst_loop(&sensors), "Error in prst_loop()");
-    k_msleep(CONFIG_PRST_SLEEP_DURATION_MSEC);
+    k_sleep(K_SECONDS(CONFIG_PRST_SLEEP_DURATION_SEC));
   }
 }

kicad/parasite.csv

@@ -3,7 +3,7 @@ Comment,Designator,Footprint,LCSC
 "1n","C1","Capacitor_SMD:C_0402_1005Metric","C1523"
 "100n","C2","Capacitor_SMD:C_0402_1005Metric","C1525"
 "12p","C3,C4","Capacitor_SMD:C_0402_1005Metric","C1547"
-"LL4148","D1","Diode_SMD:D_MiniMELF","C3011166"
+"LL4148","D1","Diode_SMD:D_MiniMELF","C9808"
 "LED","D2","LED_SMD:LED_0603_1608Metric","C2286"
 "MMBT3906","Q1","Package_TO_SOT_SMD:SOT-23","C2910191"
 "Q_Photo_NPN","Q4","snapeda:TR8","C146233"

kicad/parasite.kicad_pcb

@@ -1027,7 +1027,7 @@
     (at 66.742 55.536 180)
     (descr "Diode Mini-MELF")
     (tags "Diode Mini-MELF")
-    (property "LCSC" "C3011166")
+    (property "LCSC" "C9808")
     (property "Sheetfile" "parasite.kicad_sch")
     (property "Sheetname" "")
     (property "ki_description" "100V 0.15A standard switching diode, MiniMELF")

kicad/parasite.kicad_sch

@@ -1963,10 +1963,10 @@
     (property "Footprint" "Diode_SMD:D_MiniMELF" (at 63.5 111.125 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "https://datasheet.lcsc.com/lcsc/2205131645_JUXING-LL4148_C3011166.pdf" (at 63.5 115.57 0)
+    (property "Datasheet" "http://www.vishay.com/docs/85557/ll4148.pdf" (at 63.5 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "LCSC" "C3011166" (at 63.5 115.57 0)
+    (property "LCSC" "C9808" (at 63.5 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid b7ede69c-719d-4a3e-977e-6b4e4c5e39dd))