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Hi. Great project. I found some really new effects in a pedal called Freqout Natural Feedback Creator. My first association was that it might be worthwile implementing something of this kind in a teensy guitar pedal.

Don't mix up nRF24L01 and nRF24L01+. nRF24L01 is obsolete. There are chips/boards called RFM70/73/75. 70 and 73 are not fully compatible to the nRF24L01+. They offer some enhancements if programmed correctly. RFM75 is brandnew and could be compatible. Not tested yet. SI24R1 is a very new clone...

Physical connection. Take a look at wikipedia and SALEAE. You connect it to the lines between teensy and nRF. You may have to solder a cable to the one connecting.

Exactly. As with many other threads there is one easy way to start: use a proven example/setup as a start and then go on reading the data sheets and deepen your knowledge. As questions rise people will answer them for you one by one. Buy a SALEAE is you whish and get used to it. It is a...

Hi nameless. I am seeing that you want to go on with this more to learn than to save money or time. I would like to encourage you since the nRF24L01 or similar is a good chip to learn about. Since I am using it for many years in several customer projects let me say one thing. It uses 3 to 5...

Hi whollender. My late reply. I posponed the project for many reasons.Here is my update. I found several examples for simple doppler speed measuring with Arduino. A high gain amp and a bandpass is used most of the times. SA604 is probably a very good choice because of the inherent limiting/gain...

I had a similar problem. The reason was a bad pullup/pulldown situation. Check that idle state of your RS485 lines is correct. Otherwise at the moment when the drivers are enabled the receivers will immediately see an edge = startbit. This leads to the intent of the receivers UART to decode one...

Since we have spoken about professional autorouters in this thread I want to mention that electra from KONEKT is included (lim. to 250-pins) in the free version of Target3001. You can use it with EAGLE designs. Taget3001 itself seems to be interesting. However you don't even have to install it...

I think it was this link: https://github.com/nikropht/FreeRouting/ Don't remember 100% exactly. Simply clicked at some threads in the freerouting forum. Edited: http://www.mikrocontroller.net/topic/337014

Agree on the reliability of EAGLE. UI is not what should be expected these days. Feerouter is highly recomendable and still available. Google for it and download the Java code. It's definitely worth it. Another router which seems to be very good and not too expensive is electra by...

I can recommend metro library. I am using it for a long time and have even ported it to mbed. It leads to a non-preemptive task-like structure in code and it does not load any hidden timer IRQs. Simple, intuitive and save.

Hi syntesis. Your circuit looks right to me. To be precise, pullups may well be connected to 5V as you did since LCD and teensy are 5 Volt based or tolerant. I even prefer 5V because of better threshold margin of the signals. In your picture the resistors do not look equal. Please check. Maybe...

The bootloader code should not be the cause, I believe. Have you tried to load your programm into a teensy 3.0 instead of a 3.1? This should be the correct target for a programm which was originally built for frdmK20. Otherwise setting mbed for FRDMK22 may be worth a try too.

The K22 may well surpass the K20 in market volume achivineg a lower price and giving pjrc a better margin. I would be happy to see a K22 board, specially since I do not see great SW changes necessary for it. This helps gain stability in the libraries and saves Paul time for other tasks on the...

There may be a solution implementing a state machine driven triple decoder. There is a nice commented lib that explains that on http://www.buxtronix.net/2011/10/rot...-properly.html This must be placed in in an regular timer driven IRQ. First I would implement the IRQ and observe if there is no...

Forgot to mention that the line #if defined(__AVR__) above the mentioned code snippet must be deactivated otherwise the block is not active on the teensy 2.0

Hi. I have spent several hours with encoder problems using teensy 2.0. The encoder is used for user interface input and has a very small stepsize (ALPS). Unfortunately I have to adapt my SW to a given HW and the pins are 9 & 10, so no IRQ can be used. Aditionally the loop takes quite some time...

If teensy++3.1 is basicly a K22 board with 48 DIL pinning I expect ~ $25. A good price point would make all "power users" specially of the audio lib migrate to the T++ which would make support for you/Paul easier. Otherwise I see a lot of your time going into projects or functions that run well...

Running both installers "as Administrator" should fix it.

Hi Constantin. Let's not put too much of analog/EMC special aspects into this thread. I fear we miss the topic. In short. You are right. BLM ist the prefix. As I said, chose the type that carries twice the max current for a thumb's rule. http://www.murata.com/en-sg/products/emc/emifil/bl...

What about a simple MK22FX512VLH12 version of teensy 3.1? HW needs no changes at first sight. SW may start with FPU support for a start and add new clock rates after a while.

Hi Paul. Please allow me some suggestions for a new HW. Whenever you use small ceramic caps in parallel to a cap in the 1..10µF range please use 10nF instead ot 100nF. (See teensy 3.1) The reason is that 0603 size 100nF caps behave very poor in the RF domain. You get a much (!) better overall...

I have installed Arduino 1.0.5-r2 and patches for iteaduino-lite. Teensyduino installer would not recognize the Arduino installation. (Even running as administrator) I have to start from scratch instaling Arduino-ide, teensyduino and iteaduino-lite patches. In this order.

I am fully aware of the float variables. Thanks. I was trying to test teensy3.1 performance on a real world example and I believe that the improvement should be higher. Float emulation contains 32-bit operations and those should be a lot slower on the AVR in relation to clk speed. However I may...

Hallo. I have compiled a demo for an artificial neural net. See http://robotics.hobbizine.com/arduinoann.html On Arduino 1.0.5 and teensyduino 1.18 I have found that one ANN training cicle takes ~26 secs on a Leonardo board and ~27secs on a teensy 3.0@48MHz. Compilation is a bit slower for the...

Hi Whollender. I made a quick measurement. Output waveform moving one hand away ~20cm distance. Signal is 300mV (Millivolts) maximum moving my hand very close to the sensor. Detecting objects at 2..10 meters will give < 1 mVolts probably. For Opamps I found some better types at Analog Devices...

You are right about the gain. Good point.:) However noise is only a problem in combination with bandwidth. BW is <1KHz.;) An OpAmp with 3nV/SQRT(HZ) gives 90nVolts equivalent at the input. That should be ok. Care must be taken with impedances keeping them at the lower end. I suggest using...

Hi. Does anybody have experience connecting a radar proximity sensor to teensy 3.1? I am thinking about the Hygrosens RSM-3650. (www.voelkner.de/products/143210/Radar-Bewegungsmelder-Rsm-3650.html) The sensor is based on the doppler principle and produces an AC signal from tens to hundreds of...

My professional resume as a consultant. Cheapest, works ok: Hantek 6022BE Next: Rigol DS1052E (Exceptionally good user interface. Very good stability and features. Low res display. All in all a great bargain. I got one and hacked it to a DS1102E with 100MHz. A horrible amount of work&time to...

I need to solve the same problem. As I read in the text about the teensy loader command line mode it is recommended to use a second teensy to solve this problem. :eek: However connecting teensy 3.1 without (!) touching the button an upload command from the ide does program the chip. This means...

Teensy 3.1 is a Cortex-M4 (without FPU) w/ 256K Flash and 64K Ram. ADC is 16 bits. Two DACS. The module is small and inexpensive. Add-Ons for micro-SD, Ethernet and HiRes-Audio available. In my opinion one of the most interesting (semi-)professional platforms for mbed ever if it comes to that...

Hi. I am using Notepad++ in a similar way. Can you provide the settings or the way to call "verify" or "verify/upload" externally by sublime or Notepad++? Thanks.

Now it says: Arduino: 1.0.5-r2 (Windows 7), Board: "Teensy 3.1" In file included from analogCont_analogRead.ino:11:0: C:\Users\Eduardo de Mier\Documents\Projects\Arduino\Sketches\libraries\ADC/ADC.h: In member function 'ADC::Sync_result ADC::analogSyncRead(uint8_t, uint8_t)': C:\Users\Eduardo...

Actually I have teensy 3.1 boards. I just had the setting for the ide on 3.0 for testing if it would compile. For the actual project I will not need synchronous ADC. Pedro should get the feedback. That's all.

Hi. I tried to compile the examples but all of them give an error in ADC.h The ADC lib as well as Arduino 1.0.5r2 and teensyduino 1.18 are uptodate. Please see below. Commenting the following line fixes it. // Sync_result analogSyncRead(uint8_t pin0, uint8_t pin1) = {return...

FastAnalogIn from mbed is quite interesting

A lot of interest in this thread. Great. mbed-API @bloodline: Thanks for your offer. I will start a new customer project (scientific instrument) in May. By that time I will know more precisely what I need in terms of functionality, API-calls, ... Mbed-Api is definitely a choice. Auto-run ADC and...

How is the progress on this topic? I am struggling whether to abandon teensy 3.1 just because I prefer to use mbed. Teensy 3.1 is still the best module around for my choice and the solution for the bootloader stored in a companion chip and reloaded into Ram @ every boot time is brilliant. Please...

Thank for all the practical info. I also use Arduino IDE with external editor enabled just as Paul. Editor is Notepad++. What I am missing is the jump to lines containing errors. Can this be implemented in some easy way? (I believe that in the next project I will switch to eclipse. Sounds...

Hi. I have chosen teensy 3.1 for my running customer project. What I would like to integrate into the device is the possibility for a firmware update done by the customer on site. I would send a new binary per email. I can see three possibilities for te upload: 1. The customer connects the...