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Here is the file translated to english...thanks google translate.24433

You may have got confused with naming the Serial Ports.
The Rx/Tx pair on the top left, pins 0 and 1, are Serial1. On the Uno/Mega I suspect that the first Hardware Serial port is Serial2 whilst on...

Could you use a cheap ESP based board to get the "Over Air" bit then send it to Teensy with serial?

Might be worth updating the web page.
Are the screws supplied or not? Two pictures show no screws, 1 picture shows screws.
If screws not supplied then thread and minimum thread length should be...

Where is your code?
Include code and you might get a reply!

Might not be relevant but have you seen this.? It does all your keyboard scanning for you.

It's not good to run time critical systems on Windows since Windows itself does pre-emptive multi-tasking.
I.e. it could be doing other things when you want it to deal with your input signal.
...

In order to load this into excel, copy the text and save it into a text file called excel.txt, for want of a name, anything will do.
Start excel and create a new blank spreadsheet.
Go to Data and...

Did you have any luck trying to find out why Teensy 4.0 freezes using Snooze and EEPROM.put?

If you want to remove the Teensy, or the ESP, take a pair of snips and gently cut the headers, pin by pin.
Then when it is away from the PCB de-solder/remove each pin in turn.
Attempting to remove...

Snooze has not been implemented for Teensy 4.1. Also I believe that for Teensy 4.0 wake from deep-sleep is via a Teensy Reset.

Glad it worked out for you.

I suggest you use the Snooze library. Except for the Teensy 4.0 it works quite well.
It does not however support the Teensy 4.1.

You should also bear in mind that the Snooze library KILLS EEPROM...

What is the level shifter?

Bear in mind that they are NOT bi-directional, on this chip one out and one back.
That is ideal for what I want for Serial UART.

I have seen circuitry where one chip provides bi-directional data...

I haven't got any experience with SPI, but I would use simple UART serial.

It's already done for you and would be so simple to get going.

If you want handshaking then rts/cts is available to...

Just to complicate things further I found this.
Looks good and quite cheap.
No need for pullup/down or any other silly additions. I have ordered 5 from here.

Just found Eagle break out board for the LSF0204.
You could get it made directly without modification.

After further searching I found this GitHub entry where someone has successfully used the 8 way device and has published a Kikad PCB design for it. Since you only want 4 ways, you could modify the...

I just found some more info which has led me to an idea for you.
I will get back to it tomorrow.

I agree, but you said that the TSX0108E worked and the TSB0104 does not.
The LSF010x mentioned above looks good to me. But then I went and bought a TSB0104, so what do I know!!

I've been looking at this problem all afternoon. I will need to do uart 3.3v to 5v and back. I had purchased some TXB1040 and obviously they will not work.
I have just found this LSF010x.
Seems...

I think you need to use a TSX0104 part not a TSB0104.

If you read the data sheet it does NOT state that pull up resistors are required, but if they are present they should be at least 50k due to the low output drive of the tsdx0104. Ie the device does...

Pictures of the assembled board on Tindy show a different form of potentiometer and judging by the PCB layout it is probably impossible to misalign that sort of pot.
Examination of that type of pot...

Pictures of the assembled board on Tindy show a different form of potentiometer and judging by the PCB layout it is probably impossible to misalign that sort of pot.

The Nextion web site states that the I/O adaptor puts out 5v.
The T4 only supports 3.3v devices. You may have "blown up" that input on the Teensy.

There are 4 channel and two channel versions look for TSX0104 and TSX0102.

Why not use a 40 pin IDC cable/socket/plug wired as shown below.
23954
This will result in every other wire being gnd. Also makes it easy making the cable using DIL IDC plugs and sockets.

Oops sorry, I see that Oak Tree LLC is selling through Amazon, but check the prices I think you will see that it is buyer that is being shafted.
Prices for a T3.2 and LC are:-
...

I said UK distributors. Amazon is not a PJRC distributor.
UK distributors are:-

Cool Components, HobbyTronics, Oak Tree LLC, PiHut and Pimoroni.

They are listed here.

Even by using an extended partition which can hold other partitions, I still believe that the total number of partitions on an MBR formatted drive is 4.
A GPT partition can be formatted with up to...

Windows only allows a maximum of 4 partitions per drive.

It is possible but shipping charges are silly. Not Paul's fault but USPS. Better to buy from Paul's UK distributors.

Yes, 18 pins for 8 lanes instead of 20 pins, but also cheaper.

...or you could use something like a TSX080E, like this.
Plenty of current to drive the opto-isolators and relatively cheap.

If speed is not paramount you could consider a PCF8574 I2C 8 bit expansion chip. The current per pin is 25ma with a total of 100ma for the package.
There are also 16bit versions viz MCP23017. This...

Your data on using Serial.begin on this page https://www.pjrc.com/teensy/td_serial.html states that:-

"Serial.begin()
Initialize the Serial object. The baud rate is ignored and communication...

A possible solution could be to enlarge Serial.begin() to Serial.begin(baudRate, timeOut or delay) where Serial.begin(baudRate) /Serial.begin() defaults to a timeout/delay of 2.5 seconds, or whatever...

Could it be a timing issue, Teensy 4.x going much faster?
In order to rule out, compile for a much lower speed similar to Teensy 3.x.

You could consider one of these. It provides 5v (and 3.3v) for the Teensy. It is powered from a usb psu. You could solder a wire to the battery connection and shut down and save data to sd card, or...

Hi Frank,
If you would wish to share the cost of the board I would welcome to join in.

Here is another display. Has HDMI and VGA inputs complete with i/o board.

This display might be useful when used with the above suggestion.

since you are looking for battery power this might be of interest. Provides battery charging facilities as well. Very cheap - about $3 if I remember correctly.

EDIT:
You can get them here.

Hi Duff, hope you and your family are well.
I have posted a sample prog which demonstrates the problem under "suggestions and .....".

Both sleep and deepSleep fail. Have not tried hibernate as it does a reset each time which is not useful.

I have confirmed that the Snooze Library Kills the EEProm library.
Have raised the issue in "Suggestions and Bug Reports"

The Snooze Library seems to kill writing to EEPROM.
Is there any code for recovering Writing To EEProm after waking from sleep?
The code below demonstrates the problem.


#include <EEPROM.h>...

Hi,

I don't claim to re any sort of expert but I see a number of possible problems.

You have setup snooze to use digital and alarm - you have not used any digital input to wake up, so take the...