For Arduino

Boards to control Bosch LSU 4.9 wideband sensors and compatible units from an Arduino.. The modules have their own microcontroller and talk to your Arduino board over the SPI bus, and the function libraries keep the Arduino code down to a few lines. The shield gives you direct access to the CJ125 chip. All of them come with working code examples.

Below you will find a comparison table of the boards we sell today, the add-ons that complete your setup, and a full list of every module and shield we have made, current and discontinued.

Compare the boards

All of them read the same wideband lambda sensor, but each board is different: extra sensors, programming effort, whether it runs without an Arduino, data logging. Compare and pick the one that fits your project.

All three read the same Bosch LSU 4.9 wideband sensor. See how each one works with an Arduino →

The Pro also works on its own, with no Arduino connected. See the Pro →

Add-ons

Extra boards for your Arduino setup: more modules at once, 3.3 V compatibility and data logging.

Image	Part	Utility	Compatible Arduinos	Compatible modules
	Hubs. SPI bus wiring hub for lambda modules.	Allows you to easily connect several lambda modules to a single arduino board.	UNO UNO WIFI MEGA Others	Lambda modules: 01M11V00. 01M21V00. 01M30V00.
	Voltage adapter for SPI bus, 3.3-5V.	It allows a 5 V slave to communicate on a 3.3 V SPI bus, accepting multiple slaves.	3.3V Arduino boards such as: NANO Others,	Lambda modules: 01M11V00. 01M21V00. 01M30V00.
	Datalogger Shield with MicroSD card and RTC. Controlduino 91S00V00.	It allows data to be saved in CSV format, and has connectors to facilitate the connection of lambda modules and I2C displays.	UNO UNO WIFI MEGA Others	Lambda modules: 01M11V00. 01M21V00. 01M30V00.

All modules and shields

Every board we have made, current and discontinued. Open any model for downloads and support.

Image	Part	Measure	APP	library	Type	Buetooth	Status	Lambda IC	Lambda Probe	Enhanced Power Supply	Voltage[V]
	01D21V00	%O2, Lambda, AFR. Wideband.+ RPM + EGT	iOS, macOS and Android See details →	Lambda_d.h	Plug-and-play module with its own microcontroller — works with or without an Arduino	yes	Available	STMicroelectronics IC - L9780	Bosch LSU4.9 and others.	yes	10.8 to 16.5
	01M11V00	%O2, Lambda, AFR. Wideband.	No	Lambda.h	Module with its own microcontroller	No	Available	STMicroelectronics IC - L9780	Bosch LSU4.9 and others.	yes	10.8 to 16.5
	01S00V00	%O2, Lambda, AFR. Wideband.	No	No	Shield	No	Available	Bosch IC – CJ125	Bosch LSU4.9	No	10.8 to 16.5
	01S01V00 Replaced by Pro Lambda 01D21V00 →	%O2, Lambda, AFR. Wideband.	Android: Legacy app — live readings only	No	Shield	yes	Last units	Bosch IC – CJ125	Bosch LSU4.9	yes	10.8 to 16.5
	01M21V00 Replaced by Pro Lambda 01D21V00 →	%O2, Lambda, AFR. Wideband. + rpm	No	Lambda_rpm.h	Module with its own microcontroller. Stackable with 02S00V00	No	Last units	STMicroelectronics IC - L9780	Bosch LSU4.9 and others.	yes	10.8 to 16.5
	01M30V00 Replaced by 2 x Pro Lambda 01D21V00 →	2x(%O2, Lambda, AFR. Wideband.) + rpm	No	LambdaX2_rpm.h	Module with its own microcontroller.	No	Last units	STMicroelectronics IC - L9780	2 x Bosch LSU4.9 and others.	yes	10.8 to 16.5
	02S00V00	Temperatures, Pressures, Analogue inputs, Inductive sensor.	No	No	Stackable shield. 01M21V00 stacks on top of this board.	yes	Discontinued			yes	10.8 to 16.5

Which one to choose?

• If you want to integrate a wideband lambda sensor in your project, quickly and easily and without wasting time and resources of your arduino board, choose the 01M11V00 Module. With the instruction set of its library you can obtain the value of %O2, lambda, AFR, battery voltage…, just occupying the SPI connection pins of your arduino, and the microcontroller integrated in the module will perform all the calculations, so it will not waste almost any resources of your arduino.
• To send the data to a computer (arduino serial monitor) : Shield 01S00V00
• To send the data to the smartphone application via bluetooth (Using the included smartphone application): Shield 0S01V00.
• To send the data to your computer and/or integrate it into your project without using almost resources of your arduino board: Module 01M11V00 This module has an internal microcontroller that controls the wideband lambda probe and sends the data via SPI to the arduino which does not do any calculations, it does not consume time or resources of your arduino board. For example you could control the fan speed depending on the %O data, using almost no resources of your arduino board.

In summary

• Shield 01S00V00: it is used to obtain the value of %O2, lambda and AFR at low frequency independently of your project. to display on the computer (serial monitor) or on the mobile (with external blueooth module) at 3Hz it is suitable. It is very difficult to modify the arduino programming and to integrate it into a more complex project.
• Shield 0S01V00: serves to get the value of %O2, lambda and AFR at low frequency regardless of your project, It is suitable for displaying at 3Hz, to send Blueooth supports high frequency 100Hz. Basically it is very improved to send data by bluetooth to mobile phone, no need to add external modules to the arduino, no external power supply. It has an integrated bluetooth module to send data to the mobile. It has a filter and a buck converter that allows a 6.5V input to the arduino and power it from there in an efficient and safe way. Note: the two Shields can use the same programming, although in this model with integrated Bluetooth it would allow to send high frequency data via bluetooth. It is very difficult to modify the arduino programming and to integrate it into a more complex project.
• The module 01M11V00: It is very easy to integrate into a more complex project without losing calculation time because it has an integrated microcontroller that performs all the calculations, basically arduino only communicates SPI. This module is best if you want to integrate it into your project. You could for example control the combustion by varying the fan speed to have a % of oxygen in the smoke. You could visualise the %O2, lambda and AFR data on a display…