Comments (8)
geoffdavis
commented on August 17, 2024
I'm unaware of any particular issues between one device or the other.
All I can guess is that one of them has a stronger pull-up resistor on the input lines.
Are you using a TTL level shifter to go from 3.3v on the microcontroller to 5V that the Mitsubishi uses? Or, are you using the voltage divider circuit that the upstream HeatPump library author recommends?
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davidmerrique
commented on August 17, 2024
@geoffdavis I'm just connecting directly from the CN105 to the D1. Which is working for the other 3 units.
As I read through old issues it just seems like there are problems with some D1 Minis.
I have a couple more arriving today that I'm going to try, I'll report back. You can close this issue.
Thanks!
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geoffdavis
commented on August 17, 2024
I would try the voltage divider circuit before throwing out those D1 minis. The ESP8266 really wants 3.3v and you can cook their serial pins if you give it the 5v from the Mitsubishi on those digital pins.
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earwin
commented on August 17, 2024
@davidmerrique you can try resetting your D1s once or twice (see #49)
Though my setup has some resistors there I think (as Geoff suggests).
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jeffborg
commented on August 17, 2024
I have had a d1 mini in my air con for years now, But I'm just using a TTL level shifter. Only just recently switched firmware to esphome and has been flawless over these years.
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geoffdavis
commented on August 17, 2024
The reisistors set up as voltage dividers are indeed the poor man’s level
shifter. The MOSFET-based level shifters are the better approach. At the
4800 bps data rate of this serial line, even the cheap ones work fine.
Glad to hear that the mystery has been solved. Note that some batches of
chips may have slightly higher 3.3v logic output than others which would
explain the case where some D1 minis work and others don’t. Use the voltage
divider or level shifters and take the guesswork out of it.
…On Thu, Dec 2, 2021 at 12:52 Jeffrey Borg ***@***.***> wrote:
I have had a d1 mini in my air con for years now, But I'm just using a TTL
level shifter. Only just recently switched firmware to esphome and has been
flawless over these years.
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jamescadd
commented on August 17, 2024
I didn't realize a proper MOSFET level shifter was an option, and I need to add some level shifting. Any chance you could point to some that are known to work @geoffdavis ?
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geoffdavis
commented on August 17, 2024
Any of the IIC or I2C level shifters on Amazon or AliExpress will do the
trick. The FETs don’t need to have high frequency switching for this
application. Adafruit also has one.
This would work: KeeYees 10pcs 4 Channels IIC I2C Logic Level Converter
Bi-Directional Module 3.3V to 5V Shifter for Arduino (Pack of 10)
https://www.amazon.com/dp/B07LG646VS/ref=cm_sw_r_cp_api_glt_fabc_KCG7JGSXX1CN60HYA1FB
…On Fri, Dec 3, 2021 at 09:23 James Cadd ***@***.***> wrote:
I didn't realize a proper MOSFET level shifter was an option, and I need
to add some level shifting. Any chance you could point to some that are
known to work @geoffdavis <https://github.com/geoffdavis> ?
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