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boards:moteino [2021/11/18 17:16] – [Boot-loader] darronboards:moteino [2024/09/02 11:26] (current) – [Issues] darron
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 input for DIO1 which may be utilised for Rx timeouts. input for DIO1 which may be utilised for Rx timeouts.
  
-On the XRobotix clone the LDO VREG has been replaced. VIN max is 6V rather than 16V and current max is 200mA instead of 600mA.+On the XRobotix clone the LDO VREG has been replaced. VIN max 
 +is 6V rather than 16V and current max is 200mA instead of 600mA
 + 
 +The board has been tested to work at 2.5V and will transmit at 
 +this frequency even with the 16 MHz XTAL, however, the boot-loader 
 +has a BOR setting of 2V7 which means it will continually reboot at 
 +around 2.9V which is at the top of the BOR range for 2V7. The ATmega 
 +and SX1276 can operate at 1.8V minimum.
 ===Pinout=== ===Pinout===
 <wrap right> <wrap right>
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 This is a quick test that communications are working. This is a quick test that communications are working.
  
-The bootloader is probably DualOptiboot_V5.0_atmega328_BlinkD9.hex+The bootloader is related to DualOptiboot_V5.0_atmega328_BlinkD9.hex, perhaps an older revision.
  
-[[:interfaces:pololu|Pololu USB AVR Programmer v2.1]]+__[[:interfaces:pololu|Pololu USB AVR Programmer v2.1]]__
  
 This programming board can supply power to the circuit but not enough This programming board can supply power to the circuit but not enough
 power for radio transmission. power for radio transmission.
  
-__Configure__+==Configure==
  
 <code> <code>
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 </code> </code>
  
-__Probe__+==Probe==
  
 <code> <code>
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 </wrap> </wrap>
  
-ISP must be performed at 3V3 and beware that cheap programmers will bit bit-bang+ISP must be performed at 3V3. Beware of cheap programmers that bit-bang
 I/O at 5V. I/O at 5V.
  
-==[[:interfaces:pololu|Pololu USB AVR Programmer v2.1]]==+__[[:interfaces:pololu|Pololu USB AVR Programmer v2.1]]__
  
-I/O pins on the Pololu have 470R in series.+I/O pins on the Pololu have 470R in series and it uses target voltage sense.
  
-__Moteino__+==Moteino==
  
 PB2 must be pulled high via 100K when ISP is connected to PB2 must be pulled high via 100K when ISP is connected to
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 </code> </code>
  
-__ISP__+==Pololu==
  
 Vcc must be connected to target 3V3 because ISP will not function Vcc must be connected to target 3V3 because ISP will not function
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-__Configure__+==Configure==
 <code> <code>
 pavr2cmd --restore-defaults pavr2cmd --restore-defaults
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 </code> </code>
  
-__Probe__+==Probe==
  
 <code> <code>
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 [[https://www.hoperf.com/data/upload/portal/20190801/RFM95W-V2.0.pdf|RFM95W datasheet]] [[https://www.hoperf.com/data/upload/portal/20190801/RFM95W-V2.0.pdf|RFM95W datasheet]]
 +
 +[[https://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega328p|ATMega fuse calculator]]