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#I2C Level Converters #i2c
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Arv Evans
Hello I recently purchased a package of these I2C level converters. Have not tried them yet though. Anyone out there with experience with these modules? I got them thinking that they could allow me to do 3.3V I2C communications without having to modify my Arduino Nano modules for lower voltage, and thus slower speed. Arv _._
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Owen Vinall
Hi Arv Evans, I'm a complete newbie to Amateur Radio but not electronics Arduino's etc. I have used the same ? level converters in an Usb Rs232 5 volt logic to 3.3 ? logic conversion when uploading code to my Esp8266's. All the Esp' logic pins including Tx and Rx run on 3.3 and are rather intolerant to 5 volts. It's really the 3.3 volt Rx into the Esp that matters. I have flashed / Arduino sketches into Esps at least 100 times with no issues.(I have around 8 Esp's some have their Rx pins fried as I tried using 5 volts. Never trust a Usb to Rs232 if it states 3.3 logic without checking.). Esp's in CERTAIN areas easily rival Arduino's Owen Vk5fkov Sent from my SAMSUNG Galaxy S7 on the Telstra Mobile Network
-------- Original message -------- From: Arv Evans <arvid.evans@...> Date: 20/2/20 8:49 am (GMT+09:30) To: BITX20@groups.io Subject: [BITX20] #I2C Level Converters Hello I recently purchased a package of these I2C level converters. Have not tried them yet though. Anyone out there with experience with these modules? I got them thinking that they could allow me to do 3.3V I2C communications without having to modify my Arduino Nano modules for lower voltage, and thus slower speed. Arv _._
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Tom, wb6b
Hi,
I bough a pack of five some time ago, also. Here is an Adafruit note along with links included in the note that may offer more information. https://www.adafruit.com/product/757 Luckily the 5v Nano boards seem to be just barely in spec when connected to 3.3v parts and the pullup resistors tied to 3.3 volts. Such as with the 3.3v synthesizer chip used on the uBitx. I'm sure the ones I bough will come in handy at some point. They were definitely inexpensive to buy just in case I need them. Tom, wb6b
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My homebrew ubitx has those exact levels shifters between the arduino nano and the silabs synth and it works great.
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Kees T
Hello Arv,
I have used 2N7002 FETs and 2 resistors for that function for many years .....I wonder if those parts are 2N7002s. 73 Kees K5BCQ
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Arv Evans
Thanks Tom. I noticed that some of the 4-channel level shift boards have differing pin-outs. Could be slightly confusing if using multiple boards for the same project. Arv _._
On Thu, Feb 20, 2020 at 1:31 AM Tom, wb6b <wb6b@...> wrote: Hi,
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Arv Evans
Kees Thanks for the reply. I have used the discrete component level shifter for several projects, but this is my first try at using the integrated modules from an EBay seller. Circuit seems to be the same 2-restotrs and a 2N700x, so I'm not anticipating any problems. Arv _._
On Thu, Feb 20, 2020 at 9:11 AM Kees T <windy10605@...> wrote: Hello Arv,
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Yup. Use those all the time. Work ok… Close to spec, meaning range is 0.8-3.1 V (Lo-Hi).
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Arv Evans
Hello
I recently purchased a package of these I2C level converters. Have not tried them yet though.
Anyone out there with experience with these modules?
I got them thinking that they could allow me to do 3.3V I2C communications without having to modify my Arduino Nano modules for lower voltage, and thus slower speed.
Arv _._
-- …_. _._
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