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· MPN: PIM716

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Clipper lets you receive and transmit data over 4G LTE cellular networks - perfect for remote or mobile projects.WiFi is great, but sometimes you want your c...

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Clipper lets you receive and transmit data over 4G LTE cellular networks - perfect for remote or mobile projects.
WiFi is great, but sometimes you want your connected project to Just Work, wherever in the world it is. Perhaps you're going to a festival and don't know if there will be wireless connectivity to control your weird LED art installation. Maybe you're trying to get the tech in your shed to talk to your home automation software, but the range of your wireless router won't quite reach. Possibly you're attaching sensors to a distant beehive, canal boat, bicycle or other object with a remote or transient location?
Hooking your microcontroller up to cellular / mobile data could be your solution! Typically, transmitting sensor readings from or commands to microcontrollers doesn't consume much data compared to the needs of modern smartphones, so a small amount of pay-as-you-go data used like this goes a long way.
Clipper has a SP/CE connector on board - this means you can connect it easily to any SP/CE compatible microcontroller or add-on using a handy cable (of course, there's also pads if you'd prefer to solder wires to it). Click here to view all things SP/CE!
It also has an SMA connector for attaching an antenna. Cables and antennae are sold separately, or you can pick up a kit which includes them - just add a microcontroller!
Starter kit contains
  • Clipper 4G LTE Breakout
  • SP/CE cable
  • Antenna (108mm)
Features
  • SIMCom A7683E 4G LTE module
  • SP/CE connector (8 pin JST-SH)
  • SIM card slot
  • SMA connector for attaching an antenna
  • No soldering required (if you connect using SP/CE).
  • Compatible with Raspberry Pi Pico / RP2040 / RP2350
  • Compatible with Raspberry Pi computers
  • Dimensions: 35x29x5mm (Antenna connector is 11mm tall)
Regional compatibility
The 4G LTE module on Clipper supports the following frequency bands: 

B1/B3/B5/B7/B8/B20/B28
If you're planning on using the breakout outside of Europe we'd suggest first checking your local carriers offer 4G LTE on these bands. Networks in North America in particular only use a couple of these frequency bands, and so coverage may be limited.
Pinout and Schematic
  • Schematic
  • Pin functions (these functions are available via the SP/CE connector, and as unpopulated headers on the breakout): 
    • GND - Ground (this is pin 1 on the SP/CE connector, nearest the SIM card holder)
    • PWRKEY - Power key pin, needs to be toggled low and then high to power up the module
    • RX - UART input to breakout
    • RESET - Reset pin, pull high to keep breakout active
    • NETLIGHT - Output from LTE module, for blinking a LED when there is a network connection. It has a max output drive of 7mA and if you wire an external LED to this pin it should have a series resistor.
    • TX - UART output from the breakout
    • VDDIO - IO voltage input, 3.0 - 3.6V recommended for reliable IO. Low current consumption.
    • VDD - 3.7V - 6.0V power input to the breakout (scroll down for current consumption info)
Getting Started
You can use Clipper with Raspberry Pi Pico (or other RP2040 or RP2350 based microcontrollers) using our custom MicroPython build, which has (experimental) LTE support built in:
You can also use it with a Raspberry Pi computer (if you wire it up to the correct pins) using Pi OS's built in `ppp` library - we found the article below helpful when setting it up:
Notes
  • VDD current consumption info from our testing: 
    • Idle: 17mA
    • Sleep modes: 0.12mA - 1.63mA
    • Peak current consumption when transmitting: 700mA (the peak current is only reached for a brief moment, and the 440uF of capacitors on the breakout help to smooth the peaks)
    • The average currents we saw when actively using the module were in the 50mA - 100mA range.
  • The LTE module has quite a sensitive undervoltage circuit, so if your breakout keeps turning off randomly or when you try and do anything with it check your power supply and wiring is up to the task!

Jargon buster

Plain-language definitions for the technical terms used above.

4G LTE
4G LTE is a cellular data standard used for internet access over mobile networks. When a product offers 4G LTE connectivity, it can provide remote internet access where wired Ethernet or Wi-Fi is not available, given suitable coverage and a SIM or data plan.
breakout
A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
GND
GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
Headers
Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
LED
A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
microcontroller
A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
MicroPython
A version of the Python programming language made to run on microcontrollers. It matters because it lets beginners write readable code to control LEDs, sensors, motors and displays without needing to start with lower-level languages.
RP2040
The RP2040 is a dual-core Arm Cortex-M0+ microcontroller chip from Raspberry Pi, used on many maker boards and offering programmable I/O, multiple GPIO pins and reasonable processing speed. Code and accessories built for that chip should work where RP2040 compatibility is listed, though demanding tasks such as reading a camera can require careful pin allocation and timing.
RP2350
A microcontroller chip from Raspberry Pi used as the main processor on some development boards. Knowing the board is built around an RP2350 helps you check software support, pin capabilities and whether it suits MicroPython projects.
RX
RX means receive, usually showing data being received by the board. An RX indicator LED can help with troubleshooting USB or serial communication.
SMA
SMA is a small threaded coaxial (RF) connector widely used to attach antennas and other radio-frequency cables. A device with SMA antenna ports needs antennas or pigtails with matching SMA connectors, or a suitable adapter, to connect to them.
TX
TX means transmit, usually showing data being sent from the board. A TX indicator LED can help you see when the board is communicating or uploading code.
UART
UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.

Related Tutorials

Free guides on learn.littlebird.com.au

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