Yet another STM32 evaluation board, I think this is the only cheap board with USB HS PHY.Teensy 4 is cheaper, and has two USB PHYs, both high speed (480 Mbit/s).Wow this looks interesting, except it doesn't have a real USB socket.
Yet another STM32 evaluation board, I think this is the only cheap board with USB HS PHY.Teensy 4 is cheaper, and has two USB PHYs, both high speed (480 Mbit/s).Wow this looks interesting, except it doesn't have a real USB socket.For a hobbyist like myself, it's a good platform. It isn't really suitable for someone designing their own boards based on NXP i.MX RT106x chips, because the bootloader on the MKL02 chip on the board is proprietary. (Except for general evaluation and testing of the platform.)
Only one USB connector is soldered in (USB Micro-B, 5-pin); this one is also used for programming, no separate programmer is used. One must solder the second one on; I recommend cutting a cable and soldering the wires to the pads. Testing on Linux shows that even in Arduino/Teensyduino, over USB Serial, one can achieve well over 200 Mbit/s transfer rates using the main one. I haven't tested the second one, nor bulk USB transfer rates, carefully enough to say how close to theoretical maximum bandwidth one can get.
For development, I habitually use a cheap ADuM3160-based USB isolator (limited to full speed, 12 Mbit/s) off eBay, more to make sure my laptop USB ports won't get damaged due to my butterfingery than anything else. They're all based on the application example off the datasheet, and the only real variance is the isolated DC-DC converter they use – some are more efficient, some less, but all limit the maximum current one can draw somewhat. I'm waiting for the high-speed isolators based on TI ISOUSB211 and others to come on the market.
PJRC does have some Teensy 4.0 and Teensy 4.1 in stock right now, 2022-12-30.
For Teensy 4.1, I recommend also getting the PSRAM (or two, 16 Mbytes of PSRAM is really nice for so little money), and the Ethernet kit. Also, on 4.1 the other USB port is available on pins, so you can use the USB host cable.
The NXP MKL02 chip contains the proprietary bootloader and PJRC-specific Teensy stuff, and uses the JTAG interface. PJRC does sell the pre-programmed MKL02 chips, if one wants to make their own Teensy-compatible board. Currently, suitable IMXRT1062DV*6B or IMXRT1062DV*6A chips are very difficult to find, though.
The PJRC (Teensy) Forum is quite active, and Paul Stoffregen (creator of Teensies) actively answers questions there. You can find his Arduino and Teensyduino code at his GitHub repositories.
The next phase is clearning the bench and installing another Kallax 4x4 this time ontop of the desk as a backdrop for shelves, scopes, siggens etc. etc. Leaving the bench theoretically "clearable" after a session. We'll see if that happens.
The next phase is clearning the bench and installing another Kallax 4x4 this time ontop of the desk as a backdrop for shelves, scopes, siggens etc. etc. Leaving the bench theoretically "clearable" after a session. We'll see if that happens.
Wouldn't use a Kallax for equipment, those things have an extremely low weight limit of like 10 kg per shelf and 25 kg on top. I wanted to buy one for the same purpose, but decided against it since it's basically a glorified cardboard box with a glossy finish.
Tomorrow the postman will bring a Tiny SA Ultra.
Finally found and offer where I could not resist any longer to get one of those. Have been looking at them for several years, now.
Tomorrow the postman will bring a Tiny SA Ultra.
Tomorrow the postman will bring a Tiny SA Ultra.Had one on the radar too but was undecided and now missed the december delivery. Maybe I should just order one to get it next round in february.
Bonjour à Tous, Bon Nouvelle Année!
I have ~ Have 12 (!) handheld DVMs(!), all old and inaccurate and/or cheap Chinese junk. And lots of Simpson 260, Triplett analog VOMs.
My best is new Keysight 34465a 6.5 digit laboratory bench-top. Hardly a field pocket DVM!
Inspired by EEV blog, researched handheld DVMs.
Have Fluke electricians T5-600 clamp on, 1AC-AII, voltage hot sticks: great quality, very long lasting. Considered Fluke 287, too delicate, display not robust, overkill for a DVM.
Decided on Fluke 87V industrial DVM, best value for a versatile, long lasting, error indication, backlight long bat life, beeper. Current cat, USA not China, Fluke lifetime warranty is a big plus.
On Epay several in auction, just won ~ 1/2 new price.....included Fluke leads and yellow silicone bumper.
Arrived, like new, leads still wrapped. Great design, ergonomic controls, display and leak-proof 9V battery compartment.
At CAL lab, high resolution, 4.5 digits, well within spec on every range, using best lab standards for R, C, VDC, VAC, F, Temp,
Should have bought the Fluke 87V years ago!
Next one will be the 87V MAX = IP67, super rugged, many extras….
My highest recommendation! Your thoughts appreciated!
Bon Soirée
Jon
Finally found and offer where I could not resist any longer to get one of those. Have been looking at them for several years, now.