Search found 24 matches

by commando_j
Mon Oct 28, 2019 5:51 pm
Forum: General Discussion
Topic: ESP32-WROOM Occasional reset, and then locked in bootloader WDT
Replies: 10
Views: 952

Re: ESP32-WROOM Occasional reset, and then locked in bootloader WDT

The I2C bus can hang up. "If the data line (SDA) is stuck LOW, the master should send nine clock pulses.The device that held the bus LOW should release it sometime within those nine clocks.If not, then use the HW reset or cycle power to clear the bus. The master I2C must be able to generate this “bu...
by commando_j
Thu Oct 24, 2019 1:11 am
Forum: General Discussion
Topic: Garbage on only first lines of booloader output
Replies: 2
Views: 231

Re: Garbage on only first lines of booloader output

Well I can see how I may have caused the issue. With old age comes bad eyes. The GND pin that I thought I connected my logic analyzer to was actually the CMD pin of the ESP32 flash on my dev kit. Now I know why I was seeing crazy garbage on my SPI pins! SPI is better now, but I still have the garbag...
by commando_j
Wed Oct 23, 2019 4:41 am
Forum: General Discussion
Topic: Garbage on only first lines of booloader output
Replies: 2
Views: 231

Garbage on only first lines of booloader output

Has anyone seen this before? It only happens on one of my two ESP32 boards. I don't think it was happening before, at least I never noticed it (I'm sure I would have) Is this a partially corrupted bootloader? (Ignore the date codes that were generated). If it was a baud rate issue then you wouldn't ...
by commando_j
Mon May 06, 2019 3:35 pm
Forum: General Discussion
Topic: MCP795xx RTC ESP-IDF Library
Replies: 3
Views: 662

Re: MCP795xx RTC ESP-IDF Library

Further update. The negatives on the Maxim chip is the much higher standby current of around 100uA vs 1.xuA on the MCP part. Also, the leap year works until 2100 with Maxim, vs 2399 in the MCP. The Maxim has an integrated diode and resistor for the backup which saves you two parts on your board. Not...
by commando_j
Mon May 06, 2019 3:15 pm
Forum: General Discussion
Topic: MCP795xx RTC ESP-IDF Library
Replies: 3
Views: 662

Re: MCP795xx RTC ESP-IDF Library

Just to update my post. In my search for a different RTC that met my needs (size and cost) I discovered a pin-compatible chip to the MCP79510. The Maxim DS1390U/DS1394U. The advantage with this chip is better documentation, and there are at least some ESP32 projects with maxim RTC chips, although no...
by commando_j
Mon Apr 29, 2019 2:44 pm
Forum: General Discussion
Topic: ESP32 on Batteries - your setup
Replies: 50
Views: 23975

Re: ESP32 on Batteries - your setup

You have the option for ultra-low quiescent current buck-boost regulators if you can deal with BGA packages. Or something like this LTC3443 if money is no object. http://www.farnell.com/datasheets/43210.pdf It's hard to find a buck-boost that is cheap, easy package to solder, decent current (600mA+)...
by commando_j
Sun Apr 21, 2019 6:13 am
Forum: General Discussion
Topic: Low voltage on all pins, even 5v and 3.3v [RESOLVED]
Replies: 10
Views: 1855

Re: Low voltage on all pins, even 5v and 3.3v

Just to be sure, do you have something else you can read with your meter? A separate source, like a desktop power supply with 12V output, with nothing connected to it. Just to ensure your meter is set right. It's not set to AC voltage is it? Some meters default every time you turn them on to AC. Can...
by commando_j
Thu Apr 18, 2019 3:29 pm
Forum: General Discussion
Topic: Low voltage on all pins, even 5v and 3.3v [RESOLVED]
Replies: 10
Views: 1855

Re: Low voltage on all pins, even 5v and 3.3v

When you mean it runs flawlessly, I assume you mean it compiled and downloaded without error? You are still seeing the power fluctuations with the hello world? When the board is erased, do you still see the power fluctuations? If so, check if the AMS1117 regulator is getting hot. It may be blown, ca...
by commando_j
Wed Apr 17, 2019 7:22 pm
Forum: Hardware
Topic: a questions about burn mode
Replies: 4
Views: 789

Re: a questions about burn mode

On your kit, GPIO 0 is pulled up internally and has a button to pull down the IO when you need it.
by commando_j
Wed Apr 17, 2019 3:22 am
Forum: General Discussion
Topic: Low voltage on all pins, even 5v and 3.3v [RESOLVED]
Replies: 10
Views: 1855

Re: Low voltage on all pins, even 5v and 3.3v

Check with scope if you can. Your meter would average out the reading if its fluctuating continuously quickly enough. What is your power supply? Make sure it is not current limiting. Do you have anything on the console? Do you see any reset? It also seems like it gets a short or current limit every ...

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