Home

1. What is JEM?

• Pocket STEM IoT device that runs MicroPython
• Allows students and STEM enthusiasts to create their own STEM toys or experiments
• Users can create there own "kits" and user interface that runs on our KitLab mobile app or web app
• Users can share their kits with others to edit or use
• Teachers can get their students up and running in less than 60 seconds with only a phone
• Cables and Computers are optional!

2. Quickstart

1. Turn on JEM with power switch

2. Open the JEM Web App or install JEM iOS App
3. Open the Web or Mobile App and Connect (may take 5 - 30 secs for App to find JEM)
4. Try out one of the features using the command line

5. Here is the example from the gif

########### LED EXAMPLE ####################
from jemled import JemLed
led = JemLed()
led.set_color((100, 0, 0)) 
led.off()

3. REPL Coding Examples

You can run these examples by:

• Typing directly on the REPL terminal
• Or by adding code directly to main.py
• Or by adding code directly to your kit python file (ex: kits/simple/simple.py)

Try any of the following examples out on your repl

######## buzzer ####################
from jembuzzer import *
buzz = JemBuzzer()
buzz.start(100) # 100 hz freq
buzz.stop() # stop making sound
# try other frequencies, like 50, 100, 200, 500, 1000 ...etc

######## motion sensors (accelerometer, gyro and magnetometer) ###############
from jemimu import JemIMU
imu = JemIMU()
imu.orientation # prints out the euler angles (roll, pitch, yaw)

######## battery monitor ####################
from jembattery import JemBattery
batt = JemBattery()
batt.soc() # battery life remaining 0 - 100%

######### range / distance sensor #################
from jemrange import JemRange
range = JemRange()
range.distance # move your hand up / down over the jem2 sensor window

######### ambient light intensity sensor #########
from jemlight import JemLight
light = JemLight()
light.intensity() # move your hand up / down over the jem2 sensor window

######### pressure, temperature, humidity sensor #########
from jembarometer import JemBarometer
bar = JemBarometer()
bar.read() # outputs temperature, pressure and humidity

######### user button ###########
from drivers import button
btn = button.Button()
btn.read() # should return 0 or 1 depending if pressed

4. ESP32 MicroPython Examples

• You will most likely want to control the low level peripherals of the JEM ESP32 MCU
  • For example: gpio, i2c, pwm, timer, and adc ... etc
• This tutorial from ESP32 provides a great example
• Let's try the GPIO example
• Optional:
  • Get a simple LED like this
  • Connect the long LED lead to JEM IO4 (see pinout: https://github.com/kitlab-io/micropython/wiki/7.-JEM-Hardware-Specs#view-2)
  • Connect the short LED lead to a JEM GND Pin
• Connect to JEM on the Web App or you local terminal and type

>>> from machine import Pin
>>> p4 = Pin(4, Pin.OUT)
>>> p4.on() # LED should turn ON!
>>> p4.off() # LED should turn OFF