Differences

This shows you the differences between two versions of the page.

--- sfera [2016/11/24 10:13]
claude created
+++ sfera [2016/11/24 14:20] (current)
claude
@@ Line 1: / Line 1: @@
 ====== Debugging the RS485/Raspi ======
+{{::img_20161124_100617.jpg?nolink&800|}}
+  * LED is glowing, "flashing" (getting dark shortly) every second, as the weather station sends data every second
+{{:img_20161124_100600.jpg?nolink&800|}}
+  * We've connected the logic analyzer after the sferalabs board. Data comes in, all fine.
+{{::logic-analyzer.png?direct&1200|}}
+...and can be decoded.
+===== However, =====
+When I connect to it, it shows no data.
+<code>screen /dev/ttyAMA0 19200</code>
+//(baud rate taken from the data sheet)//
+Bluetooth is disabled:
+<code>
+$ cat /etc/modprobe.d/raspi-blacklist.conf
+blacklist btbcm
+blacklist hci_uart
+</code>
+Raspberry Pi, model 3 B
+<code>
+uname -a
+Linux raspberrypi 4.4.9-v7+ #884 SMP Fri May 6 17:28:59 BST 2016 armv7l GNU/Linux
+</code>
+Weather station is the basic Elsner P03 without modbus.
+===== Update 24. Nov 16, 14:15 =====
+> Can you please add this to /boot/config.txt
+> <code>dtoverlay=pi3-disable-bt</code>
+> Also, from the command line:
+> <code>sudo systemctl disable hciuart</code>
+> then reboot and try again?
+Didn't work. Yet.
+But I stumbled upon this:
+<code>
+$ cat /boot/config.txt
+enable_uart=0
+</code>
+Setting this to enable_uart=1 did the trick.
+{{::p03-rs485.gif?nolink|}}
+WOOHOO! \o/

sfera.1479978809.txt · Last modified: 2016/11/24 10:13 by claude

Back to top