- Stm dmesh high voltage mosfet upgrade#
- Stm dmesh high voltage mosfet portable#
- Stm dmesh high voltage mosfet mods#
- Stm dmesh high voltage mosfet plus#
A second analog channel requires hardware mods to the pcb. The Open source DSO-138 features support for 2 analog + 2 digital channels. That is if you are willing to flash the new firmware. They both now have support for digital channels. In the absence of digital outputs, I kept putting off the purchase until happily, I came across a couple of Github projects where the firmware has been rewritten and enhanced for both the DSOs mentioned.
Stm dmesh high voltage mosfet portable#
I required a portable oscilloscope for some analog related projects, but I also wanted the ability to capture digital output at the same time. In the images below, the red PCB is the DSO-138 and the blue PCB is the big brother DSO-150. While these kits can be purchased fully built, they are usually sold in a DIY state of “you solder everything” or “you solder everything minus the smd components”. NOTE: GPIO16 and GPIO17 will no longer be available for normal use after fitting the the PSRAM!!! Yes you just lost two pins!Īs to enabling the PSRAM in PlatformIO, all that is required is to simply add the following PSRAM related build defines to your “platformio.ini” file.įor some time I have been aware of the little portable oscilloscopes (DSO) kits produced by JYE Tech, such as the DSO-138 and DSO-150. GPIO16 should be pulled up to 3V via a 10K resistor to ensure that the PSRAM is deselected during boot up.Pin 6 should be wired to GPIO17 and provides the SCLK for the PSRAM.Pin 1 should be wired to GPIO16 and provides the Chip Select for the PSRAM.Pins 1, 6 and the 10K pull up are specific to the PSRAM (and the flash which has its own pin 1,pin 6 and resister pullup) and allow the two devices to be controlled individually. Pin 1 to Pin 1, Pin 8 to Pin 8) and solder all pins excepting – To perform the piggyback, just place the PSRAM on top of the Flash chip, in the correct orientation (i.e. espressif-esp32-devkitc with Can removed.Actually if you dismantled and piggybacked a WROOM-32 module you wouldn’t be able to refit the Can. Piggybacking an IC does mean having access to it (the IC), and the Lolin32 Lite, by not using a WROOM-32 module and having a custom design (unlike the DevkitC), has all the ICs exposed (and hence the reason I use them).
Stm dmesh high voltage mosfet plus#
Not willing to wait until my 16MB (megabyte) flash chips arrived – my original plan was to replace them as well, which would have given a grand total of 16MB Flash/8MB PSRAM plus the original 520KB of internal SRAM, but alas impatience got the better of me and I hastily forged ahead keeping the original 4MB of flash in place.Īnd as the plan was to piggyback the PSRAM directly on to the back of the Winbond flash chip, I would need to use the matching 3V part, namely the IPS6404L-SQ-SPN version of the PSRAM and luckily that is what I have to hand, 48 of them £0.60 each, which per unit is actually cheaper than a 23lc1024-i/sn 1024Kbit SPIRAM part, and yes you can use the PSRAM as box standard SPIRAM. Sooooo, having a bunch of Lolin32 Lites at hand and a bunch of newly acquired IPUS IPS6404L-SQ SPI/QPI PSRAM, I thereby decided to give it a go.
Stm dmesh high voltage mosfet upgrade#
Laboris documented a successful upgrade of a ESP-WROOM-32 Info Upgrade ESP32 board without psRAM with 4MB/8MB SPIRAM
Whereas the newer WROVER boards ship with PSRAM as the norm and is typically 4MB (megabytes) in size, but the WROVER based development boards are unfortunately almost double the cost of the WROOM-32 based development boards. The WROOM-32 based ESP32 development boards are quite versatile but they are lacking PSRAM as standard. It combines the high density of DRAM with the ease of use of true SRAM. PSRAM or PSDRAM is dynamic RAM with built-in refresh and address-control circuitry to make it behave similarly to static RAM (SRAM). Pseudostatic RAM (AKA PSRAM) as described on Wikipedia is, in short,
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