Using the Shell¶
The SCK (from V2.0 onwards) has an integrated command shell over USB to manage all the kits functionalities for advanced users. In this guide, we will cover how to access to this functionality in different platforms, and some examples.
What is it?¶
We could define the
shell as a text-based interface to access almost any SCK functionality. In terms of hardware, it relies on the serial communication between the SCK and your computer, so any decent USB cable connected between them will do.
How to access it?¶
Software-wise, different platforms will have different interfaces. The easiest and most reliable for all of them would be through the Arduino IDE.
Using the Arduino IDE
- Launch the Arduino IDE and select the port under
Tools > Port >:
Tools > Serial Monitor. Make sure that the dropdowns in the bottom are set as in the image below (
helpto get started.
More advanced users would probably rather use a more rugged interface. In this case, you could use
screen in your terminal of choice:
> ls /dev/cu | grep usb cu.usbmodem1411 tty.usbmodem1411 > screen /dev/cu.usmodem1411 SCK > ...
> pio device monitor SCK > ...
The port will take a little time to appear in your list of devices. Normally the LED of your SCK will be static white during that period.
help command outputs a quite intuitive explanation of all the commands:
SCK > help reset: Resets the SCK version: Shows versions and Hardware ID rcause: Show last reset cause (debug) outlevel: Shows/sets output level: outlevel [0:silent, 1:normal, 2:verbose] help: Duhhhh!! pinmux: Shows SAMD pin mapping status sensor: Shows/sets sensor state or interval: sensor sensor-name [-enable or -disable] or [-interval interval(seconds)] read: Reads sensor: read [sensorName] control: Control sensor: control [sensorName] [command] monitor: Continously read sensor: monitor [-sd] [-notime] [-noms] [sensorName[,sensorNameN]] saved: Shows locally stored sensor readings: saved [-details] [-publish] free: Shows the amount of free RAM memory i2c: Search the I2C bus for devices power: Controls/shows power config: power [-info (extra info)] [-batcap mAh] [-otg on/off] [-charge on/off] [-sleep min (0-disable)] config: Shows/sets configuration: config [-defaults] [-mode sdcard/network] [-pubint seconds] [-readint seconds] [-wifi "ssid" ["pass"]] [-token token] esp: Controls or shows info from ESP: esp [-on -off -sleep -wake -reboot -flash] netinfo: Shows network information time: Shows/sets date and time: time [epoch time] [-sync] state: Shows state flags hello: Sends MQTT hello to platform debug: Toggle debug messages: debug [-sdcard] [-espcom] [-list] shell: Shows or sets shell mode: shell [-on] [-off] mqtt: Publish custom mqtt message: mqtt ["topic" "message"]
The SCK outputs a lot of information via serial. This can be sometimes confusing while typing commands. You can silent it a bit with this command:
SCK > shell -on Shell mode: on
This will turn your LED static yellow, and no output except responses to your commands will be given.
Remember to turn it off after you are done experimenting!
SCK > shell -off Shell mode: off
Set the recording configuration¶
If you want to change your recording mode to, for instance,
sdcard mode, you could do so by typing:
SCK > config -mode sdcard
To set it up in
SCK > config -mode network -wifi "SSID" "PASSWORD" -token 123456
Note that the token is not between quotes since it's always 6 digits
To modify your wifi:
SCK > config -wifi "NEWSSID" "NEWPASSWORD"
You can check your current configuration by typing
SCK > config Mode: sdcard Publish interval: 60 Reading interval: 60 Wifi credentials: not configured Token: not configured Mac address: 11:22:33:44:55:66
Set recording and publication intervals¶
In order to understand the reading and publication intervals, it is important to describe how the structure of the measurements is done:
- Overall reading interval: base period for the SCK to take a measurement
- Individual sensor reading interval: period for each sensor to take a measurement. It is defined as N times the Overall reading interval
- Publication interval: time for the SCK to publish to the Smart Citizen Platform, independent of the reading interval.
Each of the sensors can be configured independently, with a reading interval N times the overall reading interval. For instance, after the
SAM firmware V0.9.7, all the sensors are read every 60s except the PMS5003, which is read every 5 minutes or 5 times the reading interval.
In the case of the publication interval to the Smart Citizen Platform, the default is 3 minutes.
This configuration option is very interesting to be used for battery saving. Make sure you check the battery calculator
All this can be configured using the shell interface. For instance, to set the publication interval to every 10 minutes, we could do:
config -pubint 600
Or to set the reading interval to every 3 minutes:
config -readint 180
Or both at 10 minutes:
config -pubint 600 -readint 600
If we want to configure one specific sensor, we can do so by typing the following, only remember, that it's rounded to the closest integer multiplier of the overall reading interval:
SCK > sensor temp -interval 360 The sensor read interval is calculated as a multiple of general read interval (180) Changing interval of Temperature to 360 Saved configuration on eeprom!!
For instance, if we try to do 1.5 times the reading interval of the temperature sensor, we will get:
SCK > sensor temp -interval 240 The sensor read interval is calculated as a multiple of general read interval (180) Changing interval of Temperature to 180 Saved configuration on eeprom!!
Some limitations apply though:
- The minimum reading and publish interval is 5s
- The maximum reading interval is one hour
- The maximum publish interval is one hour
At the moment there is no command to return to the default configuration. You should use:
config -pubint 300 -readint 60 ... sensor pm -interval 300
Get version data¶
Check your hardware and firmware version data with the command
SCK > version Hardware Version: 2.1 SAM Hardware ID: 5934C4B550515157382E3120FF151210 SAM version: 0.9.1-30e1776 SAM build date: 2019-05-07T02:45:29Z ESP MAC address: 86:0D:8E:A7:7F:CC ESP version: not synced ESP build date: not synced
List/modify the active sensors¶
By typing in
sensor, a list of enabled and supported sensors is displayed:
SCK > sensor Disabled ---------- PM board Dallas Temperature [...] Enabled ---------- Temperature (60 sec) Humidity (60 sec) Battery (60 sec) Light (60 sec) Noise dBA (60 sec) Barometric pressure (60 sec) VOC Gas CCS811 (60 sec) eCO2 Gas CCS811 (60 sec) PM 1.0 (60 sec) PM 2.5 (60 sec) PM 10.0 (60 sec)
To disable one sensor, you can type in part of the sensor name:
SCK > sensor -disable Noise Disabling Noise dBA Saved configuration on eeprom!!
To enable it, if it's present:
SCK > sensor -enable Noise Enabling Noise dBA Saved configuration on eeprom!!
Only if available!
If the sensor you are trying to connect is not recognised, the kit will complain:
SCK > sensor -enable atlas Failed enabling Atlas Temperature
Read/Monitor some sensors¶
If one sensor is enabled, you can
read it (once) or
monitor it (as fast as the SCK can):
SCK > read Noise Noise dBA: 53.85 dBA
To monitor one sensor:
SCK > monitor light Time Miliseconds Light 2019-07-10T17:58:07Z 6 137 2019-07-10T17:58:07Z 98 137 2019-07-10T17:58:07Z 98 136 2019-07-10T17:58:07Z 98 137 2019-07-10T17:58:07Z 108 137 2019-07-10T17:58:07Z 98 137 2019-07-10T17:58:07Z 98 137 2019-07-10T17:58:07Z 108 137 2019-07-10T17:58:07Z 98 137 2019-07-10T17:58:08Z 98 137 2019-07-10T17:58:08Z 108 137 2019-07-10T17:58:08Z 98 136 ...
Or all of them, with no arguments:
SCK > monitor Time Miliseconds Battery Light Temperature Humidity Noise dBA Barometric pressure VOC Gas CCS811 eCO2 Gas CCS811 PM 1.0 PM 2.5 PM 10.0 2019-07-11T09:13:04Z 5 37 137 28.75 57.72 1.5 101.29 1.00 408.00 1.5 1.5 1.5 2019-07-11T09:13:07Z 3195 37 138 28.78 57.65 1.5 101.30 1.00 408.00 1.5 1.5 1.5 2019-07-11T09:13:08Z 694 37 136 28.77 57.62 1.5 101.29 1.00 408.00 1.5 1.5 1.5
If you don't need to output the
miliseconds column (the time since last reading) or the
timestamp, you can do so by:
SCK > monitor -noms light Time Light 2019-07-10T17:58:58Z 136 2019-07-10T17:58:58Z 136 2019-07-10T17:58:58Z 137 2019-07-10T17:58:58Z 137 2019-07-10T17:58:59Z 136 ...
SCK > monitor -notime light Miliseconds Light 6 137 98 137 98 137 99 137 108 137 ...
If your kit has no time configured (the LED should be flashing), the output would look like:
SCK > monitor Noise Time Miliseconds Noise dBA 0 1 52.83 0 187 50.36 0 187 52.05 0 187 51.95 0 187 48.28 0 187 48.72 0 187 50.81 ...
Something cool to do with the
monitor, is to log the sensor output into a file for later analysis. For instance, in your terminal you could do:
> echo "monitor pm light" > /dev/cu.usbmodem1411 && screen -L /dev/cu.usbmodem1411
Then, if we check the contents of the file (normally something like
monitor light Time Miliseconds Light 2019-07-11T09:10:05Z 6 141 2019-07-11T09:10:05Z 98 141 2019-07-11T09:10:05Z 99 141 2019-07-11T09:10:05Z 98 141 2019-07-11T09:10:05Z 108 141 2019-07-11T09:10:05Z 98 141 2019-07-11T09:10:05Z 98 141 2019-07-11T09:10:05Z 98 141 2019-07-11T09:10:06Z 98 141 2019-07-11T09:10:06Z 98 141 2019-07-11T09:10:06Z 108 141 2019-07-11T09:10:06Z 98 141 2019-07-11T09:10:06Z 98 141 ...
This can be useful in case you want to log data as fast as possible, with little delay between readings (~100ms).
Advanced (but cool) example!¶
Making most of the digital microphone
The digital microphone in your SCK uses an FFT algorithm to calculate the final sound pressure level (SPL) in different scales (A, C, Z). The FFT spectrum is also available for user analysis. Let's have a look!
First, enable it with:
SCK > sensor -enable fft Enabling Noise FFT
- Then, monitor and log it in a file with:
echo "monitor fft" > /dev/cu.usbmodem1411 && screen -L /dev/cu.usbmodem1411
- In this file, we will have something like:
12 15 19 20 0 ... 12 23 2019-07-11T09:30:01Z 5 null ...
The values between the dates are the actual FFT spectrum. We will now clean the lines with the dates and then plot the data. For this, we will use a
pythoncode to make things easier. You can download the code here.
If we run this code in
python3in the same folder where the screenlog from before is:
> python spectrum_example.py
We will have two outputs: a
csv file with the spectrums in rows, and a png image that looks like this!
You can see that we were playing with a tone generator to make some high pitch noises at 10kHz and 20kHz.