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If you are behind a wireless router, you can use a $3 ESP8266-01 for your RTC. Flash the ESP with the Lua nodeMCU firmware and upload these two scripts to the ESP: -- File name: init.lua print("set up wifi mode") wifi.setmode(wifi.STATIONAP) wifi.sta.config("ret13x","XXXXXXXXX") --here SSID...

Nice algorithm for computing running mean and variance, http://www.johndcook.com/standard_deviation.html

I am using this DPDT USB switch, http://www.fairchildsemi.com/ds/FS/FSUSB42.pdf The application is for charging a Dell Venue 8 Pro tablet. This tablet charges from a 2.1A source according to the "dumb" USB charging spec.; e.g. D+ D- shorted. In normal usage, the tablet locks out any I/O on the...

I just received an email from SurplusShed offering the Brainlink Bluetooth/IR controller for $20 + $6 shipping US (one week only), http://www.surplusshed.com/pages/item/r3537.html http://www.brainlinksystem.com/brainlink-hardware-description It looks to be a fun device and I bought one. It...

@Hemi345 The wires are about 13" long and they have heat shrink on each end that extends to the very tip of the female socket. I think they are custom made. I ordered some of these 2mm crimp sockets so it should be possible to duplicate them...

The question is; do you think this scheme would work with a 20X2, http://www.edn.com/design/integrated-circuit-design/4335429/Microcontroller-provides-SRAM-battery-backup And more specifically, powering a 23K256 SRAM from an output pin and retaining the data by switching to power from a CR2032...

I am working with the MAX3100, http://datasheets.maximintegrated.com/en/ds/MAX3100.pdf I selected the MAX 3100 because I thought this chip would give an easy way to get some experience with hardware SPI on the 20X2 (e.g. SPI in, serial out and reading/writing to registers). From the datasheet...

I just did a Google search on the Forum and it turned up exactly 3 hits, max3100 site:www.picaxeforum.co.uk I am going to use this chip with a 20X2 to learn a bit about SPI and thought that there might be some code floating about. Baxter

Could anyone suggest a part/s to build the interface described in this Application Note (Figure 1), http://pdfserv.maximintegrated.com/en/an/AN85.pdf And also, what is a suitable resistor value? Baxter

Reading through the manual I cannot find any reference to configuration of the 20X2 as a SPI slave. Is it possible to do this; and if not, is a Max3100 or a NXP SC16IS740 suitable as a viable alternative to act as a fake slave and talk to the Picaxe via Tx, Rx. Baxter

I am testing a small board that incorporates an 08m2 together with an inverter circuit to interface to a straight USB to serial adapter. Everything works ok, but the 08m2 does not want to accept a new download without a hard reset. The program is: 'Picaxe 08m2 Mini Board test #picaxe 08M2...

I decided to refresh my toner transfer skills with a mixture of through hole and smd parts. For lack of anything better, the circuit is a basic non-inverted USB serial interface to a Picaxe 08/08m2; nothing new here. The pins are brought out to Arduino style stackable headers. These headers...

Ok, here is the problem. A squirrel (or squirrels) is using my roof as a path to go from a tree in the front of the house to another tree in the rear. Because of the nature of squirrel claws, this is very destructive to the shingles. Cutting down the trees is not an option. There is a low tech...

I came across this at Dontronics, http://www.dontronics-shop.com/4d-usb-5v-kit-of-parts.html Shipping kills the deal for me (AUD$12.00), but for Australians it might be better. Baxter

I have a MAX883 5v regulator on a breadboard hooked up according to the attached application circuit from the data sheet. I am using a 3uf capacitor on the output because that is all I happened to have at hand. The input is from the Wii battery (6v) discussed here...

The MCU is not a PIC so probably not in keeping with the spirit of the Forum, but it's free, http://www.st.com/internet/evalboard/product/253215.jsp You just need to register and they will send it to you. I am not certain if it is only for US residents. Baxter

I am trying to construct a latching power switch with the following specifications: 1. 3.3V/5v, 200ma operation 2. push button on-off 3. power on-off from a microcontroller The Pololu Lv switch satisfies requirements 1 and the off requirement of 3, http://www.pololu.com/catalog/product/751...

Can anyone suggest some guidelines on the use of setfreq m64 for the 20X2? Baxter

I have read this excellent summary, http://www.picaxeforum.co.uk/showthread.php?8609-PICAXE-Input-Pin-Types From it, I conclude that if you power the any of the Picaxes with 5V then you can use either 3.3V or 5V peripherals without problems. My question is relative to a 3.3V powered Picaxe...

I am testing the following program: pause 1000 'set INT1 (C.1) to trigger Interrupt on rising edge hintsetup %00100010 ;enable interrupt flags INT1 (C.1) setintflags %00000010,%00000010 setint %00000010,%00000010 main: for b1 = 0 to 7 sertxd("The value of b1 is ",#b1,13,10)...