NX3224F024 (_011R) - low power mode - deep sleep doesn't work good - Nextion Discovery 2.4

1

I bought about year ago NX3224F024_011R for battery project and it worked well.
From Nextion documenation site:

32 lowpower Low Power Discovery Series. Low Power 0.25mA deep sleep

A few days ago I bought 2 same displays and lowpower=1 only a little decrease mA usage.
With ‘lowpower=0’ is about 17mA and with ‘lowpower=1’ 11mA.

The first display with lowpower=1 shows on measure 1mA (it is acceptable).
The new two displays models are same, firmware same, program same, everything is the same, the only difference is that the first was produced some time ago.

I perform a test with above command and sleep=1 and results are same.

FIRST (WORKS GOOD):
Connected! Com:COM6,baudrate:9600,Model:NX3224F024_011R(RTP),firmware Ver:S72,Device serial number:0B663401CC158C3D,CPUID:61744,Flash Size:4194304(4MB)address:0
Forced upload baudrate:115200  Start uploading
Download finished! Total time: 0 Hours 0 Minutes 33 Seconds

SECOND (WORKS BAD):
Connected! Com:COM6,baudrate:9600,Model:NX3224F024_011R(RTP),firmware Ver:S72,Device serial number:228D340142FC0455,CPUID:61744,Flash Size:4194304(4MB)address:0
Forced upload baudrate:115200  Start uploading
Download finished! Total time: 0 Hours 0 Minutes 33 Seconds

THIRD (WORKS BAD):
Connected! Com:COM6,baudrate:9600,Model:NX3224F024_011R(RTP),firmware Ver:S72,Device serial number:228D3401C678F650,CPUID:61744,Flash Size:4194304(4MB)address:0
Forced upload baudrate:115200  Start uploading
Download finished! Total time: 0 Hours 0 Minutes 33 Seconds

Look at photo:

Nextion
Nextion1454×1168 185 KB

2

This article could be helpful to double check against what you are seeing:

3

Thanks for article, but there is no magic there.
‘lowpower=1’ is the key command and it should do the job and it does on the older display.
I uploaded demo from article in my display, but the measurement results are same.

Project is powered from battery, so current about 10mA is not promoted 0.25mA on Nextion site and my pilot can only work for 1 week.
If the current will be like declared (40 times lower) it will work for 40 weeks. So it is critical for me.

4

It was new software or firmware issue.
Downgrade to version Nextion Editor v1-63-3 causes firmware downgrade on TX/RH upload and current consumption backs to normal.

5

On mine discovery 2.4 display with v1.65.1 nextion editor current consumption on sleep mode is 16mA and low power doesnt work. When i downgrade the nextion editor to v1.63.3 the current consumption in sleep mode is 8mA and low power still doesnt work… Any ideas?
Im sending values like this:
mySerial.print(“lowpower=1”);
mySerial.write(0xff);
mySerial.write(0xff);
mySerial.write(0xff);
delay(100);
mySerial.print(“sleep=1”);
mySerial.write(0xff);
mySerial.write(0xff);
mySerial.write(0xff);

6

Sending these commands over serial will wake the Nextion each time you try to put it into sleep…
More details and sample code on how to do things in this article: The Sunday Blog: New Discovery HMI available - And a first specific Demo project - Nextion

7

OK, so how properly sleep display over serial?