Langstone Discussion Forum

[G8GKQ]

Hi Joe

You can order a Portsdown 4 card, and then load the Langstone software: M3, Langstone Config, Install Langstone V2. After reboot, select M3, System Config, Start-up App, Boot to Langstone.

Then it will be a Langstone whenever you turn it on.

73

Dave

[joefran7300]

Hi Dave
Thank you very much for you help and information,i has build the langstone and i mange to boot it up and have the screen working but i like to know how to shutdown instade of switch off the supply..
Many thanks
73's
Joe 9H1GT

[G8GKQ]

Hi Joe

From Langstone, simply select "SET" and then "SHUTDOWN". After that you can safely disconnect the power.

Dave

[joefran7300]

Hi Dave
Many thank you the information..will do that..
73's
Joe

[joefran7300]

Hello to all..
I'm building the langstone project and tell now i finished with the 7" and pluto working and i can transmitt, now i like to connet the MCP23017 i2c expander but the SCA and SDA are used for the screen so i put it with the same connections of the MCP23017 i2c expander but when i switched on the unit it begen to go TX and RX alone...can any one has an idea what is wrong please..
73's Joe 9H1GT

[g0mjw]

From Colin's git hub page:

When using the MCP23017 module Port B will output the 8 band select bits. Port A bit 0 will be the PTT input, Port A bit 1 will be the Key input and Port A bit 7 will be the Tx Output.

So what have you got connected to Port A bit 1 ? Do not leave it floating.

[radiogareth]

I added this expander to my PD4/Langstone and from memory, I used a diode OR from the two sources to control my PTT relay. This isolated the two signals from each other and everything worked as I wanted. Just a couple of1N4001.
Gareth

[joefran7300]

Hi
I just conected the MCP23017 i2c expander board only with the supply and the SCA and SDA only to check but when i switch on the transceiver it begin TX and RX..
joe

[g0mjw]

So you left the input floating? Don't do that. Tie it up or down with a resistor. Remember the rule to never leave a high impedance input unterminated.

There is a weak internal pull up, but I don't know if it is enabled and better to do it properly. Here is the data sheet:

https://ww1.microchip.com/downloads/en/ ... 01952c.pdf

Mike

[joefran7300]

Hi Mike
Many thanks my fried yes it's my fault as i left every pin open.. i will put a ik pull up to the 3.3v supply and see as i am using the 8 relay board
with the opto cuplers as you can find them from any were on the internet i bought it from AliExpress so the relays will control the band coaxial switches so i will be isolated from the Pi..
73's Joe