Display? ILI9341 touchscreens
The ILI9341 touchscreens are cheap and good. We bought several from BuyDisplay (nicely packed, all work well) as well as from PJRC (all good) and eBay (many broken in shipping). For the price, full color, and touchscreen you get a full UI or GUI. We forked Paul's library here and modified some examples: ILI9341_t3 and wrote some helper code for scrolling etc: ILI9341_helper. We use it on some new manufacturing test fixtures and really like it. It eliminates the need to have a PC at the manufacturing site. The users like it to since it is simple, small, and easy to manage.
For temp sensors we like the TMP275, direct to I2C. As long as they are thermally connected to the FETs (a PCB trace from the FET heatsink or from the FETs TH pads to under the sensor will do) they will do fine and are very simple and cheap to use. Library on github: Systronix_TMP275.
All the fans we use lately are 24V, with power supplies of course 24V. We use the OKI 78SR series switchers followed by linear regulators as needed. PC fans as others have noted are 12V and lots of them are available with fluid or ball bearings.
For getting a lot more digital outputs from Teensy we like the PCA9557 I2C 8-bit I/O register, we are using a number of them on a new product. PCA9557 Library. We have now many billions of test cycles on multiple boards, using our fork of the wonderful @nox771 i2c_t3 library.
I like that you added remote sensing, if you need to know voltage at the remote supply points. If all you want is CC then all you care about is the load current of course; voltage drop on the wires doesn't matter.
You've probably seen Arachnid Labs Re:load pro on Tindie. It's only 25W sink without a fan. I have the re:load 2 and it's fine.
We had/have some 300W to 450W supplies to test, so I bought a Tekpower TP3710A on Amazon for $350, 150W, and supplement it with some huge ceramic resistors rated for 120W each, 1-8 ohms, in series and or parallel as needed, plus a fan, to get up to higher loads.
My favorite little opamp for current sinks is the LMP7716 series, single supply. We've used it for some pretty precise laser diode driver CC designs. We drive FETs with it and also amplify the current sense resistor to make it readable for monitor and display.
Just found out about this project today, nice to see it's still moving along.
The ILI9341 touchscreens are cheap and good. We bought several from BuyDisplay (nicely packed, all work well) as well as from PJRC (all good) and eBay (many broken in shipping). For the price, full color, and touchscreen you get a full UI or GUI. We forked Paul's library here and modified some examples: ILI9341_t3 and wrote some helper code for scrolling etc: ILI9341_helper. We use it on some new manufacturing test fixtures and really like it. It eliminates the need to have a PC at the manufacturing site. The users like it to since it is simple, small, and easy to manage.
For temp sensors we like the TMP275, direct to I2C. As long as they are thermally connected to the FETs (a PCB trace from the FET heatsink or from the FETs TH pads to under the sensor will do) they will do fine and are very simple and cheap to use. Library on github: Systronix_TMP275.
All the fans we use lately are 24V, with power supplies of course 24V. We use the OKI 78SR series switchers followed by linear regulators as needed. PC fans as others have noted are 12V and lots of them are available with fluid or ball bearings.
For getting a lot more digital outputs from Teensy we like the PCA9557 I2C 8-bit I/O register, we are using a number of them on a new product. PCA9557 Library. We have now many billions of test cycles on multiple boards, using our fork of the wonderful @nox771 i2c_t3 library.
I like that you added remote sensing, if you need to know voltage at the remote supply points. If all you want is CC then all you care about is the load current of course; voltage drop on the wires doesn't matter.
You've probably seen Arachnid Labs Re:load pro on Tindie. It's only 25W sink without a fan. I have the re:load 2 and it's fine.
We had/have some 300W to 450W supplies to test, so I bought a Tekpower TP3710A on Amazon for $350, 150W, and supplement it with some huge ceramic resistors rated for 120W each, 1-8 ohms, in series and or parallel as needed, plus a fan, to get up to higher loads.
My favorite little opamp for current sinks is the LMP7716 series, single supply. We've used it for some pretty precise laser diode driver CC designs. We drive FETs with it and also amplify the current sense resistor to make it readable for monitor and display.
Just found out about this project today, nice to see it's still moving along.