LoPy

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  ADC Help
  Jan 17, 2017, 2:14 PM • iber   Jan 17, 2017, 4:43 PM

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  Jan 17, 2017, 4:43 PM

  G20 = P12 https://docs.pycom.io/pycom_esp32/pycom_esp32/datasheets.html look here for attenuation https://forum.pycom.io/topic/226/lopy-adcs/14 3. same as point 2
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  Power backup for RTC
  Jan 15, 2017, 9:55 AM • rvandam   Jan 17, 2017, 7:50 AM

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  R Jan 17, 2017, 7:50 AM

  @abilio I thought it would be possible to power only the RTC. Going with your solution (power backup for the whole board) I think I will go for a battery pack option (in combination with the schottky diode). My intention is to power the boards with 5v so a 4,5V battey pack must do the job. Powerlosses here are incidental, and not very long. Thanks for the help!
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  Reading from a Polar H7 Bluetooth Heartrate sensor
  Jan 14, 2017, 12:46 PM • arneme   Jan 14, 2017, 3:44 PM

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  A Jan 14, 2017, 3:44 PM

  I was afraid that the notification part was missing in the firmware but great if it appears soon :-). Thanks for the speedy reply.
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  generating random with crypto
  Jan 13, 2017, 9:50 AM • iber   Jan 14, 2017, 7:44 AM

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  Jan 14, 2017, 7:44 AM

  uos.urandom is based on a linear feedback shift register, that is seeded with a number derived from the MAC address. The values will "look" like random for a whole period, but still easily predictable. crypto.getrandbits is based on a hardware random number generator that gathers it's bits from random events (noise) received by the WiFi and Bluetooth radios. This source, according to the Espressif, passes randomness tests. @obertuckerz112, needed for writing a few AES examples? probably not. Needed for real life applications? The experts in cryptography say that you need a good source (as in unpredictable) of random numbers for things like the initialization vector (IV). Clearly, uos.urandom is not. In order to allow people to construct the best possible applications, we hence provide access to the hardware random number generator getrandbits as an usable source and recommend the people to use it instead of uos.urandom for cryptography purposes.
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  cannot import name SD
  Nov 5, 2016, 5:52 PM • rauburtin   Jan 13, 2017, 4:24 PM

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  Jan 13, 2017, 4:24 PM

  Hello @cypereddy, I think you already found the reason for it to stop working, G10 (P23) is the clock for the SD card ;) . Here is the list of pins that are used by the SD card: https://docs.pycom.io/pycom_esp32/library/machine.SD.html?highlight=sd card#class-sd-secure-digital-memory-card
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  Lopy - Wifi Bridge
  Jan 12, 2017, 8:19 PM • Apollo   Jan 13, 2017, 8:23 AM

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  Jan 13, 2017, 8:23 AM

  @Apollo said in Lopy - Wifi Bridge: I wasn't planning to watch Netflix over Lora, but was planning to send messages and maybe listen to a web radio station. This made me think I could achieve 300 Kbit/s: http://www.semtech.com/wireless-rf/rf-transceivers/sx1272/ LoRa itself is a radio technology with many different options, like bandwith, data rate, error correction rate, etc. LoRaWAN is a complete network solution specified by Lora Alliance and on the physical level using LoRa technology. LoRaWAN is using unlicensed frequencies shared with other users another non-lora systems. To let other systems work, there is 1% or 0.1% transmit duty cycle limitation imposed by the regulators. LoRaWAN is intended to serve sensor networks with one way communication mainly with low speed, low data volume. If you go for P2P or other protocol but using the 868MHz band rules are still valid. At least in EU. In other regions it may be different. Your use case is not for LoRaWAN, it is not for Internet applications and not a WiFi, 3G/4G replacement.
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  V 1.8.7 Micropython Released - support importing compiled .mpy files - More RAM ?
  Jan 13, 2017, 2:08 AM • mkharibalaji   Jan 13, 2017, 6:44 AM

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  Jan 13, 2017, 6:44 AM

  Micropython supoorts compiled .mpy files since a while. This option is not enabled on LoPy. You can do so, if you build your own image. Just add the line: #define MICROPY_PERSISTENT_CODE_LOAD (1) to esp32/mpconfigport.h and rebuild the flash image with make BOARD=LOPY after building, you can load the image to the lopy witth make BOARD=LOPY flash Be sure to connect G23 and GND, which is needed for all variants of flash loading. You will NOT have more RAM at runtime, but be able to run larger code, since the RAM is not needed for compiling. For building the image you need to setup the build environment. Instructions can be found at https://github.com/pycom/pycom-micropython/README.md, section ESP32. And yes, a Linux system is best for that purpose. It might be a virtual machine, at least for creating the image.
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  Someone can write a step by step guide for connecting LoPy to TTN ( in my case I don't have any gateway but I want to use LoPy as a micro-gateway) Thanks.
  Jan 10, 2017, 2:36 PM • Officina   Jan 12, 2017, 3:50 PM

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  B Jan 12, 2017, 3:50 PM

  @gertjanvanhethof : Note that TTN will allow gateways using the current Semtech demo protocol (UDP) to connect as well, see https://www.thethingsnetwork.org/forum/t/packet-forwarder-future/4021/3
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  LoRaWan configuration
  Nov 18, 2016, 4:14 PM • tbradshaw   Jan 12, 2017, 3:30 AM

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  C Jan 12, 2017, 3:30 AM

  Note: I updated the code below because the duty_cycle parameter isn't supported. here is the function clean: def select_subband(lora, subband): if (type(subband) is int): if ((subband<1) or (subband>8)): raise ValueError("subband out of range (1-8)") else: raise TypeError("subband must be 1-8") for channel in range(0, 72): lora.remove_channel(channel) for channel in range((subband-1)*8, ((subband-1)*8)+8): lora.add_channel(channel, frequency=902300000+channel*200000, dr_min=0, dr_max=3)
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  Getting the binary file to flash via FTP
  Jan 11, 2017, 11:56 AM • jeremy   Jan 11, 2017, 12:12 PM

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  Jan 11, 2017, 12:12 PM

  @jeremy try: https://software.pycom.io/downloads/1.2.2.b1-LoPy_868.tar.gz for the 868Mhz version or https://software.pycom.io/downloads/1.2.2.b1-LoPy_915.tar.gz for 915Mhz Everything you need is inside the 'Pycom Firmware Update' app bundle, even if you can't run it you should be able to right click on it and "Show Package Contents". The tools, including the update tool (also Python) are in Contents/Resources/src/bin
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  On air time of lopy
  Jan 10, 2017, 7:57 PM • this.wiederkehr   Jan 10, 2017, 7:57 PM

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  BLE woes ?
  Jan 10, 2017, 1:32 PM • duffo64   Jan 10, 2017, 3:21 PM

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  Jan 10, 2017, 3:21 PM

  @duffo64, thanks a lot for your report. We will check into it.
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  Re-flashing LoPy to initial firmware
  Jan 9, 2017, 11:18 AM • Colateral   Jan 10, 2017, 9:49 AM

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  Jan 10, 2017, 9:49 AM

  @Colateral, using the firmware upgrade tool?
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  This topic is deleted!
  Jan 10, 2017, 9:15 AM • mac_ha   Jan 10, 2017, 9:15 AM

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  Suppress status messages
  Jan 10, 2017, 8:50 AM • robert-hh   Jan 10, 2017, 9:01 AM

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  Jan 10, 2017, 9:01 AM

  @robert-hh, in the current firmware version you cannot do it, but this will change in future releases. Hope it helps :)
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  This topic is deleted!
  Jan 9, 2017, 12:22 AM • jmarcelino   Jan 9, 2017, 12:22 AM

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  Free RAM in 1.2.0.b1
  Jan 5, 2017, 9:11 PM • lmetcalfe   Jan 6, 2017, 8:26 AM

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  Jan 6, 2017, 8:26 AM

  Yes, if you change the message to "Hi"
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  Little more info?
  Jan 5, 2017, 11:29 PM • interval   Jan 5, 2017, 11:29 PM

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  Reboot problem when using LoRa radio at certain intervals!
  Jan 5, 2017, 10:34 AM • henrik_nelson   Jan 5, 2017, 10:55 PM

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  Jan 5, 2017, 10:55 PM

  @daniel 1.2.0.b indeed fixed the problem. Great!
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  This topic is deleted!
  Jan 5, 2017, 8:37 PM • Colateral   Jan 5, 2017, 8:37 PM

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