Comments (3)
rnestler
commented on September 24, 2024
to obtain either a working code for proof that Arduino Uno
The Arduino Uno runs with 5V right? So it may need level shifters (https://www.adafruit.com/product/757) for the I2C communication to work.
The SLF3S-1300F needs a supply voltage between 3.2V and 3.8V, so powering it with 3.3V is fine.
no additional pullups,
Are there existing I2C pullups on the Arduino Uno? If yes, when they pull up to 5V this may damage the SLF3S-1300F since the input voltages on SCL and SDA would be higher than its supply voltage.
Oscilloscope reading of SCL and SCL during serial monitor updates the serial monitor error : periodically (pulled down from 2v to 0V
From this it seems to me that there are no I2C pull up resistors. So if there really are no existing pull-ups on the Arduino Uno, consider adding pull-up resistors to 3.3V, which may work for communication with the Arduino Uno, since 3.3V is above the logic threshold of 2.5V which is to be expected of a 5V powered device.
Hope that helps 🙂
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rnestler
commented on September 24, 2024
Btw. from your oscilloscope screenshot I guess you speak German, right? Feel free to respond in German if that is easier for you, I'm from the German speaking part of Switzerland so it is my native language 🙂
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dandelion-cmd
commented on September 24, 2024
Lieber Herr N.
Danke wirklich vielmals für die Interpretation und Hilfestellung zur
Hardware.
War irgendwie der Meinung, die pullupRs sollten schon installiert sein,
aber offenbar nicht, (zum Glück in diesem Fall) . Bestellte
levelshifters sollten schon lange angekommen sein, sobald da baue ich
entsprechend auf. Zwischenzeitlich versuche ich mit pullup nach 3.3v mit
hilfe von Rs und lasse Sie den Fortschritt wissen.
Mit den besten Grüssen, bleiben Sie gesund
Daniel
Am 27.05.2020 um 11:14 schrieb Raphael Nestler:
…
to obtain either a working code for proof that Arduino Uno
The Arduino Uno runs with 5V right? So it may need level shifters
(https://www.adafruit.com/product/757) for the I2C communication to work.
The SLF3S-1300F needs a supply voltage between 3.2V and 3.8V, so
powering it with 3.3V is fine.
no additional pullups,
Are there existing I2C pullups on the Arduino Uno? If yes, when they
pull up to 5V this may damage the SLF3S-1300F since the input voltages
on SCL and SDA would be higher than its supply voltage.
Oscilloscope reading of SCL and SCL during serial monitor updates
the serial monitor error : periodically (pulled down from 2v to 0V
From this it seems to me that there are no I2C pull up resistors. So
if there really are no existing pull-ups on the Arduino Uno, consider
adding pull-up resistors to 3.3V, which /may/ work for communication
with the Arduino Uno, since 3.3V is above the logic threshold of 2.5V
which is to be expected of a 5V powered device.
Hope that helps 🙂
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