I'm not sure how the UART ones work, wish I could help more with this. Perhaps CraziFuzzy can help, or someone else on this thread. I am also confused about whether or not there is LIN to UART translation for the UART compressors. CraziFuzzy thinks that there is new sniffing that must be done for ...

In response to my previous post above, I just got it working, but I had to find an older version of SavvyCAN. It works for me, and my mac, on version v199.1. However, it does not work on any of the follow-up versions I've seen on Collin's website (V208, V213, Pre-Release development build from ...

Sorry the EVTV board came un-programmed. They shouldn't have sent it like that. Over at savvycan.com there is a binary "updater" which actually just flashes precompiled firmware to the board -> https://www.savvycan.com/GVRETupdate.zip you can use that on basically any Arduino Due based board but ...

Hello, I am just catching up with this thread. Were you able to get your Falcon running smoothly? The Mach E motors are so cool, but there doesn't seem to be a lot of info on them yet, regarding car hacking. Update us on your progress, when you get a chance, and thank you for sharing this project ...

I've got a question for all on this thread. I noticed that the Nissan Leaf models without a heat pump do not have a direct LIN communication line to the compressor, but rather a "COMP_TX" and a "COMP_RX" to the compressor. These compressors are the Panasonic ones. It appears that the PTC Heater ...

Great work! I don't know, unfortunately, but I vaguely recall finding online that some similar compressors have an operating range of between 200 to 400 V DC. You could try checking out the service manuals, specifically the HA (Heater and Air Conditioning System) and HAC (Heater and Air ...

That's really helpful! I haven't hooked anything up, but it sounds like I'll need a LIN transceiver instead of straight to the compressor. That makes much more sense and I saw a couple models earlier in the chat

@maiks, I'm not sure about any of the compressors. I imagine the code supports both ...

Thanks! I just setup github account at https://github.com/RERides-EV. I've made some mods to your code. Goal is to create modules based on controller/device. I can then #include modules for each component I add to a build. For this build, in addition to the Leaf AC compressor, I plan to add temp ...

Thanks! I just setup github account at https://github.com/RERides-EV. I've made some mods to your code. Goal is to create modules based on controller/device. I can then #include modules for each component I add to a build. For this build, in addition to the Leaf AC compressor, I plan to add temp ...

Hi DaveEV, Thanks for asking about my code. I apologize, once I finished this project, I moved on to some different projects and haven't programmed Arduino in a while. However, based on my recollection, I believe you are correct about pin 18. I don't remember exactly how pins 7 and 5 function. I'll ...

aot93 wrote: ↑Wed Oct 30, 2024 2:06 pm I don't,
But I should have the bits to make a LIN setup, just a level shifter required by the looks of it?

Hello, this post may help you if you need to send LIN with an Arduino:
viewtopic.php?t=2136

Nice work, please keep us updated.

Also, the Nissan Leaf shop manual shows the polarity, though it was difficult for me to find. Let me know if you need more help on this.

Got it working.. A question.. Do you measure the system pressure for on-off control?


Wow! Congratulations! I remember the feeling when I first got it running.

Here is my experience. I turn the condenser fan on and off with a four-position (off, plus three evaporator fan speeds) switch. When ...

what is the minimum voltage required of the HV side of the compressor?

Great work! I don't know, unfortunately, but I vaguely recall finding online that some similar compressors have an operating range of between 200 to 400 V DC. You could try checking out the service manuals, specifically the ...

Thanks for Sharing.. My compressor is different from this


You should still be able to use the LIN code, but you will have to check if someone else on this forum or somewhere else has hacked your compressor. Once you have the correct message to send, you should be able to use my code.

Good luck ...

I think these are used in Nissan Leaf SV and SL editions.

It is a ES27C according to the listing, and it is from 2015 according to the listing.

These are the images from the eBay listing, since it is hard to take a photo of my compressor in my vehicle.

Hi All,

I think my compressor is a Denso ES27C, but the tag is hard to read.

The code is as follows. Basically, it is a way to make the Arduino send a UART message that looks like a LIN message. Let me know if you have any questions!

****BEGINNING OF CODE****

#define EVAP_VOLTAGE_7_PIN 7

int ...

hi,are you able to share the Arduino sketch,I also have the dream to have AC running using the leaf compressor,i have 3 compressors sitting down in my garage,im also wondering how you run and monitor the compressor pressure,how do you accomplish this?thanks


Good morning, yes, I'd be happy to ...

Good morning, yes, I'd be happy to. sorry for the late response. Give me a couple of days to organize a response and I'll share the code. Hopefully I can answer any questions you have. The main idea of the code is to continuously (once every 200 ms or so) send a message to the compressor, and make ...

1. Probably. or change the message depending on a input signal on/off

2. use a LIN transceiver and connect the output to a logic analyser like a saleae logic (clone)


Thank you for the Saleae logic idea, it worked great. I was able to confirm the frame address I was sending (previously I only ...

Hello all, I was able to write some code for my Arduino Mega to use UART to mimic LIN, and the compressor ran directly from the microcontroller. Although I tried to directly use frame address 0x3B, the compressor didn't seem to run. Once I added the two parity bits (Bits 6 and 7 of the frame signal ...

manny wrote: ↑Tue Aug 20, 2024 2:15 pm 1. Probably. or change the message depending on a input signal on/off

2. use a LIN transceiver and connect the output to a logic analyser like a saleae logic (clone)

Thank you! I will try this out and let you know what I find.

Hello again, I was able to get my compressor to spin using Frame ID 0x3B followed by 0xB3 0x05 0x00 0x90 0xFF 0x00 0x00 0x00. I used a Microchip Technologies Lin Analyzer connected to an old laptop, then sent the message continuously. I noticed the compressor only spines using the ENHANCED checksum ...