https://github.com/ldab/sara-rx-application-board
SARA-R4 NB-IoT + Cat-M1 + GNSS application board - NINA-B3 with Secure MQTT
https://github.com/ldab/sara-rx-application-board
Last synced: over 1 year ago
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SARA-R4 NB-IoT + Cat-M1 + GNSS application board - NINA-B3 with Secure MQTT
- Host: GitHub
- URL: https://github.com/ldab/sara-rx-application-board
- Owner: ldab
- License: mit
- Created: 2019-12-18T07:36:51.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2020-11-11T10:27:09.000Z (over 5 years ago)
- Last Synced: 2025-02-17T17:44:54.309Z (over 1 year ago)
- Language: C
- Size: 9.27 MB
- Stars: 0
- Watchers: 3
- Forks: 4
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# SARA-Rx application board
SARA-R4 NB-IoT + Cat-M1 + GNSS application board - NINA-B3 with Secure MQTT
[](https://github.com/ldab/SARA-Rx-application-board/releases/latest)
[](https://github.com/ldab/SARA-Rx-application-board/blob/master/LICENSE)
[](https://github.com/ldab/SARA-Rx-application-board)
# **:heavy_exclamation_mark:BEFORE YOU DO ANYTHING, CHECK BATTERY POLARITY:heavy_exclamation_mark:**
## TODO
- [ ] More details about battery etc...
- [ ] !!! Better Socket close URC handler.
- [ ] Check AT response based on the last chars, in order to avoid missing URCs when after "OK" for example
- [ ] Implement Subscribe;
## Energy Budget
* 88mA active current;
* Code takes ~10 seconds to execute;
* Wakes every hour;
* 40uA Sleep current;
* 10 hours of light available;
* V charge ready = 3.67V;
* V Over discharge = 3.6V;
* V Over charge = 4.12V;
**Source Power Required = 3.8mW**
**Storage Required = 4.73mAh**
### Sleep Current
| Component | Current |
|----------- |--------- |
| SARA-R410 | 7uA |
| NINA-B3 | 3uA |
| Batt ADC | 3uA |
| SHTC3 | 0.5uA |
| TP4054 | 1uA |
| TXS0108 | 5uA(?) |
| TPS61021A | 17uA |
| TOTAL | ~37uA |
## Nordic SDK
* This is based on nRF5_SDK_16.0.0_98a08e2, get yours here: https://www.nordicsemi.com/Software-and-tools/Software/nRF5-SDK/Download
1. Sign in to the AWS IoT Console
2. Register a Device in the Registry
3. Configure Your Device
4. View Device MQTT Messages with the AWS IoT MQTT Client
https://docs.aws.amazon.com/iot/latest/developerguide/iot-gs.html
* 120mA active current;
* Code takes 15 seconds to execute;
* Wakes every hour;
* 2mA Sleep current *This needs to be optimized*;
* 10 hours of light available;
* V charge ready = 3.67V;
* V Over discharge = 3.6V;
* V Over charge = 4.12V;
1. Clone this repo to a local folder ```> git clone https://github.com/ldab/SARA-Rx-application-board```
2. Point the `$(SDK)` @`./code/ninab3/blank/ses/libuarte_pca10056.emProject` to where you have installed Nordic SDK, for example `C:\nRF\nRF5_SDK_16.0.0_98a08e2`
3. Like so: `macros="CMSIS_CONFIG_TOOL=C:/nRF/nRF5_SDK_16.0.0_98a08e2/external_tools/cmsisconfig/CMSIS_Configuration_Wizard.jar;SDK=C:/nRF/nRF5_SDK_16.0.0_98a08e2"`
4. Open the SEGGER Embedded Studio project file located in `./code/ninab3/blank/ses/libuarte_pca10056.emProject`
* PS. don't forget to set the NFC Pins as GPIO on the Preprocessor: `CONFIG_NFCT_PINS_AS_GPIOS`
Ref. https://devzone.nordicsemi.com/f/nordic-q-a/44638/how-to-move-an-sdk-example-out-of-the-sdk-tree
## IoT Dashboard
* Adafruit https://io.adafruit.com provides a free MQTT broker with a Dashboard allowing this project to be displayed publicly with little to no effort
* Create an account and insert your KEY as the `MQTT_PASS`
* `MQTT_USER` is the username used for creating the account.
* Adafruit expect data as a json, for example:
```
sprintf(_msg, "{\"feeds\": {\"T\": %.01f,\"H\": %.01f,\"Bpc\": %d,\"RSRP\": %.02f,\"Bv\": %.02f}}",
temperature, humidity, batt_lvl_in_percentage, modemInfo.RSRP, _b)
```
* The topic, groups and feeds are created automagically, on the example the MAC address is added as an identifier:
```
sprintf(topic, "lbispo/g/nina_%X/json", NRF_FICR->DEVICEADDR[0]);
```
https://io.adafruit.com/lbispo/dashboards/moree?kiosk=true
## Efficiency
## Schematic
[](./PCB/schematic.pdf)
## PCB
## BOM
[](./KiCad/BOM.csv)
## Enclosure
## Kown issues, limintations
* MQTT Socket Implementaition can only **publish** QoS 0 messages.
## Thoughts or Improvements
* Use STATUS 2 of AEM10941 as last grasp;
* Control boost converter EN, in order to turn SARA Off;
* Remove boost converter, as it does not boost a lot since Vbatt ON = 3.6V.
* SARA RESET Pin access;
* Use 101b AEM10941 Configuration in order to Vovdis = 3.0V givin extra ~20% battery (?).
* Open Drain 74LVC3G07 buffer on NINA LED, in order to avoid leakage.
## Credits
* [MQTTBox](http://workswithweb.com/mqttbox.html) for Windows in order to communicate with the broker and check messages;
* [CloudMQTT](https://www.cloudmqtt.com/) Free Cloud Broker;
* MQTT implementation inspired and based on [knolleary PubSub Client](https://github.com/knolleary/pubsubclient);
* AT Commands implementation inspired on [vshymanskyy TinyGSM](https://github.com/vshymanskyy/TinyGSM);
* GitHub Shields and Badges created with [Shields.io](https://github.com/badges/shields/);