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Gilisymo LS53L0X and Arduino Due

This article will show you how to connect the brand new Gilisymo plugin the LS53L0X to an Arduino Due.

What is Gilisymo plugin?

Gilisymo is a French company based in Grenoble, created on 2017.
The first product from Gilisymo is an intelligent distance sensor the LS53L0X based on two STMicroelectronics's components: a time of flight and a stm32f030 microprocessor.  It is used on Robotics, Automations, Gesture and more.
Find the Gilisymo plugin here:

The LS53L0X plugin is capable to provide a distance from 3 cm to 200 cm.
The difference with other distance sensors is the internal FW of the stm32f030 and the fact that when we give the power to the LS (used to simplify LS53L0X) it provides the ranging distance on the three interfaces UART, i2c and PWM.

In addition, there are lot of control parameters to customize the quality of the ranging to modify the interrupt signal or to customize the PWM signal.

Let start and see how it is simple to use LS!

The connection

The LS needs only four wire for this tests, +3v3, GND, TX and RX, connected as follow.

The sketch

The first example will show how to send basic commands over UART. The sketch send "disable" command to the LS then wait 5 second, then send "enable" command and again wait for 5 second.
The visual effect in the serial monitor is that we have data for 5 seconds and nothing for next 5 seconds, then this repeat indefinitely.

You can find the Source code on the following link: 

The first example is the SerialEnableDisable_ls53l0x.

Setup and UART config

Here we use two serial ports from Arduino Due: Serial and Serial1.The Setup() function will initiate both Serial and Serial1 to 115200 baud.The Loop() starts with the Serial/Serial1 connection.Both Serial and Serial1 are connected together and in that case, we can use the Serial1 for the LS plugin and the Serial for the output in the serial Monitor

The second part of the Loop() uses a switch case to avoid using delay function that is blocking. In fact, in that case, the connection between the two serial ports cannot be functional; the risk is to loose data.
The first command sent to Serial1 is the “disable”.


The timer is stored in Timer variable and in the next loop the switch case is on case 1.
In the case 1 a check is done to know if 5 seconds has done. In that case in the next loop the switch case in on case 2.
In case 2 the new command is sent to LS plugin:


The timer is stored in Timer variable and in the next loop the switch case is on case 3 (default).
In the case “default”, a check is done to know if 5 seconds has done. In that case in the next loop the switch case restart from case 0.
At the end we can see 5 second ranging followed by 5 seconds not ranging. This sequence repeats indefinitely.

The output of serial monitor

Example with serial plotter

Instead of using the serial monitor, we can use the serial plotter. New version of serial plotter accept to have text and number so even if the LS output the prompt, the plotter ignore it.
For this example, I will use the SerialEnableDisable_ls53l0x example that you can find in the same GitHub:

The differences between the first example and the new one are on the setup function.

In the Setup code we do two times disable, this to be sure to send the command.
Normally we should send command and wait for the prompt, if the prompt does not arrive then send command again and repeat this until a timeout, in the example we simplified by sending commands two times.
We print the version of the LS FW with the following:


The output is:

LS53L0X> LS53L0X V1.6.129

We change the starting text with the command:

Serial1.println("set StartingText=");

After this command, the starting text is empty and we have only numbers.

The following command will ensure that only ranging value is printed and not all the internal values from VL53L0X:

Serial1.println("set PrintAllRangeValues=0");

The following command will force to use the last good ranging data in case of error:

Serial1.println("set ErrorMode=2");

Now I run the plot instead of the monitor:

You can use more commands to customize the LS plugin, you can find them in the LS documentation:


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For more detail about the Gilisymo plugin, please visit
The connectionThe LS needs only four wires for this tests, +3v3, GND, SDA and SCL, connected as follow.
Note that the LS has problem in the serigraphy, the version actually available has the SDA and SCL inverted! Check the version you have before run the demo. 

The sketchThe sketch starts to search the LS plugin connected. When it founds the plugin, it saves the address in a global variable and a flag is set to avoid repeating the search. For all the further loops, the sketch read the ranging data from LS and then wait for 100 milliseconds. The visual effect in the serial monitor is that we have a new data every 100 milliseconds indefinitely. You can find the Source code on the following link: ht…

How to program LS53L0X with ST-LINK

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Program the LS53L0X is very easy. As you already know it contains the STM32F030 a STMicroelectronics micro-controller. You can buy a ST-Link and follow the documentation or you can use a Nucleo Board.

ST-Link :

All Nucleo Boards are composed of two parts: The St-link board and the micro-controller board. The ST-Link board is the little part that you can chose to separate from the micro-controller part. This little board is very useful, in fact from that board you can just use it as UART to USB converter

I usually use this board to provide power at 3.3V and to control boards with serial UART, not just to program CPU.

To Program the Light Saber LS53L0X I use this schema:

You can find the pinout on gilisymo site :

ST-Link from Nucleo Board Light Saber LS53L0X Signal CN4 pin 2 SWCLK pin 1 SWCLK CN4 pin 3 GND pin 3 GND CN4 pin 4 SWDIO pin 2 SWDIO CN4 pin 5 RST pin 12 NRST …