It has been well over a month that Gravitech released the ESP32 NANO32 Development board (link). But as is obvious, the units have not been in popular distribution in most countries, India being one of those. It is very rare to find any mention of the ESP32 on online selling platforms here in India.
However, we finally managed to grab some units of the NANO32!
You may skip the article and start right away with some NANO32 development by following our ESP32 Tutorial series.
The NANO32 was received in perfect condition (through a re-seller). We liked how the unit was shipped and protected. Apparently, the sealed package is the original packaging from Gravitech. They probably figured static shielding was not enough so they did go to the extents of using conductive foam to protect the header pins on the NANO32. Excellent!
Not quite sure what the serial number WLWF-1484 means, curious how many of these are in circulation! Have any ideas? Leave us a comment below!
A Closer Look!
Here is a closer look at the ESP32 NANO32 development board. The simple, standard 100 mil header will definitely make breadboarding easy with this module.
Armed with a microUSB interface, the board sports these relevant features:
- USB-UART bridge: The bridge IC (a tiny QFN-20) is the FTDI FT231
- The on-board flash is the Winbond 25Q32, apparently a 32 MBit flash. You would want nothing less on the 650 DMIPS ESP32!
- A 40MHz crystal for the ESP32. Hopefully 10 ppm tolerance!
- A chip antenna, for which Gravitech links to this datasheet.
- There are 2 buttons on the NANO32, which enable easy programming mode selection and resetting of the device.
- A very thoughtfully included LED, connected to GPIO16 - comes in handy for indication!
- Immersion gold PCB, which is really good considering that the PCB contains RF components directly on board.
What is missing?
Let's take a look at what might be dodgy with this board! Is there something they could have added without significant changes to the board?
- Where are the schematics?! Not sure about you, but we at IoTBits go crazy when we have to take the top-down development approach and we have no schematic to refer to! Got the schematic for this? Please leave us a comment below!
- Seems like they could have narrowed the board down by a 100 or 200 mils! Would have really helped with the breadboarding work. Nobody minds the length - but the width can cause issues on a single-breadboard job.
- The chip antenna has been properly located, but it would be directly above the breadboard metal area when mounted. Might have effects on the RF performance? IOs 22 and 21 are routed very close to the matching network with no ground via stitching as well.
- They could have added an empty footprint for SRAM on the bottom side of the board! Additional SRAM socket is not featured on almost any board out so far.
Apart from these, the NANO32 is a very useful little kit for those wanting to start out with the ESP32! Yes, you may not get lucky with the ESP32 touch sensing features, but you can get away with trying almost everything else!
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