More digital lines on the Raduino..
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This an idea that some sketch writers might want to try.
Example: Take three lines out to a BCD to decimal chip like a 4028 and get 8 outputs - you can switch that many output filters! 2 lines = 4 out 3 lines = 8 out 4 lines = 16 out In the uBitx there are 4 filters at the TX and that will need only two control lines from the Raduino. Just a thought! Cheers -- Raj, vu2zap Bengaluru, South India. |
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Or... use I2C expanders where you can have 8 or 16 lines at a time for each
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address and use no digital outputs off the Raduino. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch - K9ZC Staunton, Illinois Owner - Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Like us on Facebook! email: bill@... -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Raj vu2zap Sent: Wednesday, January 24, 2018 7:03 AM To: [email protected] Subject: [BITX20] More digital lines on the Raduino.. This an idea that some sketch writers might want to try. Example: Take three lines out to a BCD to decimal chip like a 4028 and get 8 outputs - you can switch that many output filters! 2 lines = 4 out 3 lines = 8 out 4 lines = 16 out In the uBitx there are 4 filters at the TX and that will need only two control lines from the Raduino. Just a thought! Cheers -- Raj, vu2zap Bengaluru, South India. |
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Doc,
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I agree but a transistor and relay can't handle that! Raj At 24/01/2018, you wrote:
Or... use I2C expanders where you can have 8 or 16 lines at a time for each |
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The 8574 I2C expander is a nice part. Good idea.? Only a 2 byte write, so lag time shouldn't be a problem On Wed, Jan 24, 2018 at 10:28 AM, Dennis Zabawa <kg4rul@...> wrote: With an I2C expander, the TX_A, TX_B, TX_C and CW_TONE lines could be implemented freeing up 4 digital I/O lines. --
Paul Mateer, AA9GG Elan Engineering Corp. NAQCC 3123, SKCC 4628 |
Raj vu2zap
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