stt

Attiny_Solar_Energy_Harvest/code/blink_LED_nodelay_128KHz.hex

@@ -0,0 +1,6 @@
+:100000000AC01BC01AC019C018C017C016C015C03E
+:1000100014C013C012C011271FBFCFE5D0E0DEBF50
+:0A002000CDBF03D000C0F894FFCF5D
+:10002A0048ED4CBF41E047BF44E041B940B9FECF7B
+:02003A00E2CF13
+:00000001FF

Attiny_Solar_Energy_Harvest/code/blink_LED_nodelay_def.hex

@@ -0,0 +1,6 @@
+:100000000AC017C016C015C014C013C012C011C05A
+:1000100010C00FC00EC011271FBFCFE5D0E0DEBF5C
+:0A002000CDBF03D000C0F894FFCF5D
+:08002A0044E041B940B9FECFEA
+:02003200E6CF17
+:00000001FF

Attiny_Solar_Energy_Harvest/docs/5.tex

@@ -127,6 +127,41 @@ for the sketch. This lines up.\footnote{Although for an unknown reason, every co
 
 The blinking LED works. Let's move on.
 
+\textcolor{green!60!blue!70}{ \subsubsection{IO Port Switching Speed}}
+Using the above code without any delay_ms, I get the following results from a default clock
+speed, and a 128KHz clock speed. This test was done to confirm that I could change the clock with
+\begin{verbatim}
+    //Write CCP
+    CCP = 0xD8;
+    //change CLK to 128KHz
+    CLKMSR = 0b01;
+\end{verbatim}
+There was no issue.
+\begin{verbatim}
+Default CLK (8MHz? or 1MHz?): 160KHz IO Switch
+128KHz CLK: 2.5KHz IO Switch
+\end{verbatim}
+I am going to pursue 128KHz for starters, for lower current dissipation. Note that with the Arduino loader, it is cumbersome to test and change code as you move along. It is
+therefore going to be necessary to use a programmer, with a dedicated header on board.
+\textcolor{green!60!blue!70}{ \subsubsection{VCC 1.8V}}
+The lowest power supported: 1.8V can be applied, without any configuration
+needed. It does not affect IO switching speed (although obviously amplitude is affected).
+\begin{verbatim}
+128KHz CLK (5.0V): 2.5256  KHz IO switch
+128KHz CLK (3.3V): 2.5477  KHz IO switch
+128KHz CLK (1.8V): 2.5849  KHz IO switch
+\end{verbatim}
+As voltage drops, IO increases.
+\\
+\textbf{VCC Dropout voltage:}
+From 1.5, it drops out at 1.248V or so. Comes back at about 1.34V
+\\
+Test size of 1.
+\\
+Can't run this with one (AA) battery, but you could with 2.
+\\
+Current Draw: 128KHz - IO test, 1.8V, 0.08mA (~78uA) (tested w/3478A)
+\\
 
 
 

Attiny_Solar_Energy_Harvest/docs/6.tex

@@ -0,0 +1,171 @@
+
+\documentclass[11pt]{article}
+%Gummi|065|=)
+\usepackage{graphicx}
+\usepackage{caption}
+\usepackage{xcolor}
+\usepackage[vcentering,dvips]{geometry}
+\geometry{papersize={6in,9in},total={4.5in,6.8in}}
+%\title{\textbf{Door Alarm}}
+\author{Steak Electronics}
+\date{}
+\begin{document}
+
+%\maketitle
+
+%\tableofcontents
+\textcolor{green!60!blue!70}{
+  \section{Attiny Solar Energy Harvest Tests}}
+
+I have the following:
+\begin{itemize}
+\item Solar panels
+\item Attiny 10
+\end{itemize}
+To this list, I will add a supercap, and an energy harvesting IC. The goal being to load the super cap during the day, and to run 24/7. I will need an exceptionally low power micro. The super cap will need to be about 3.3V or 5V.
+\textcolor{green!60!blue!70}{
+\subsection{Micro Considerations}}
+The Arduino Atmega328P is not an option. I'm looking to have a current draw of only 1mA max, (ideally 500uA) when active. Moteino is also not an option for this. Those are made for batteries. I want to be battery free. A super cap, however can be used to store energy. I'll get to that shortly.
+
+For micros, I have some Attiny10 on hand, and these have a reasonably low power pull in active mode. Let's build those up first. What will the micro do? No idea. I haven't a clue.
+
+\textcolor{green!60!blue!70}{
+\subsubsection{Micro Notes}}
+Must run at 1.8V / 1MHz per front page of data sheet, for 200uA draw in active mode.
+\\
+\\
+
+
+\textcolor{green!60!blue!70}{
+\subsection{Energy Storage}}
+I don't want a battery. Let's go with a super cap. The solar panels will only be active some of the time, so I will want to harvest energy with some kind of IC into the cap when the sun is out.\footnote{Reference: www.analog.com/media/en/technical-documentation/technical-articles/solarenergyharvesting.pdf is a start. I'll need to do more research.}
+
+\textcolor{green!60!blue!70}{ \subsection{Make parts, not scrap}} I will 
+want to make sure that all parts I build are perf board parts, not 
+breadboard scrap (to be torn down and rebuilt again). This is an Attiny, 
+so no need to test much, yet.
+
+\textcolor{green!60!blue!70}{ \subsubsection{Testing Arduino Loader}}
+Tested this with the blink_LED.c in code folder. The code is as simple as possible. 
+It is the following:
+\begin{verbatim}
+//#include <xc.h>
+#include <avr/io.h>
+#include <util/delay.h>
+
+int main(void)
+{
+    // PB2 output
+    DDRB = 1<<2;
+
+    while(1)
+    {
+        // Toggle PB2
+        PINB = 1<<2;
+        _delay_ms(500);
+    }
+}
+\end{verbatim}
+When programmed in Mplab, with XC8 compiler, and Attiny10 support, I get the following
+hex output:
+\begin{verbatim}
+:100000000AC020C01FC01EC01DC01CC01BC01AC01B
+:1000100019C018C017C011271FBFCFE5D0E0DEBF41
+:0A002000CDBF03D000C0F894FFCF5D
+:10002A0044E041B940B95FE966E871E05150604087
+:0A003A007040E1F700C00000F5CFB0
+:02004400DDCF0E
+:00000001FF
+\end{verbatim}
+The content of this hex isn't the focus of this passage. Instead, I want you to review the 
+results of a D for Dump Memory, by the Arduino Loader.
+\begin{verbatim}
+
+Current memory state:
+
+registers, SRAM
+      +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
+0000: 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
+0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
+0020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
+0030: 00 00 00 00 00 00 03 00 00 79 00 03 00 00 00 00 
+0040: B7 AD AE FA 58 70 63 6B FB 5A B4 1B FF FF 35 3F 
+0050: 67 D7 33 43 DF 5F FB 72 C9 7D FE E9 9D C5 00 12 
+NVM lock
+      +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
+3F00: FF FF 
+configuration
+      +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
+3F40: FF FF 
+calibration
+      +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
+3F80: 79 FF 
+device ID
+      +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
+3FC0: 1E 90 03 FF 
+program
+      +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
+4000: 0A C0 20 C0 1F C0 1E C0 1D C0 1C C0 1B C0 1A C0 
+4010: 19 C0 18 C0 17 C0 11 27 1F BF CF E5 D0 E0 DE BF 
+4020: CD BF 03 D0 00 C0 F8 94 FF CF 44 E0 41 B9 40 B9 
+4030: 5F E9 66 E8 71 E0 51 50 60 40 70 40 E1 F7 00 C0 
+4040: 00 00 F5 CF DD CF FF FF FF FF FF FF FF FF FF FF 
+4050: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
+4060: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
+(...some memory omitted here for brevity...)
+43E0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 
+43F0: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
+\end{verbatim}
+
+Notice that the "AC020C01F" is set. That is from the hex. But the 01000...
+before it seems to be missing. Some deciphering of how the Arduino programs
+the Attiny is in order here. It also doesn't end the same.
+
+Regardless, when programming, the Arduino reports 70 bytes written, and
+likewise in the Mplab project memorymap.xml file, it also notes 70 bytes
+for the sketch. This lines up.\footnote{Although for an unknown reason, every command registers twice on the Arduino serial monitor, but this appears to be harmless.}
+
+The blinking LED works. Let's move on.
+
+\textcolor{green!60!blue!70}{ \subsubsection{IO Port Switching Speed}}
+Using the above code without any delay_ms, I get the following results from a default clock
+speed, and a 128KHz clock speed. This test was done to confirm that I could change the clock with
+\begin{verbatim}
+    //Write CCP
+    CCP = 0xD8;
+    //change CLK to 128KHz
+    CLKMSR = 0b01;
+\end{verbatim}
+There was no issue.
+\begin{verbatim}
+Default CLK (8MHz? or 1MHz?): 160KHz IO Switch
+128KHz CLK: 2.5KHz IO Switch
+\end{verbatim}
+I am going to pursue 128KHz for starters, for lower current dissipation. Note that with the Arduino loader, it is cumbersome to test and change code as you move along. It is
+therefore going to be necessary to use a programmer, with a dedicated header on board.
+\textcolor{green!60!blue!70}{ \subsubsection{VCC 1.8V}}
+The lowest power supported: 1.8V can be applied, without any configuration
+needed. It does not affect IO switching speed (although obviously amplitude is affected).
+\begin{verbatim}
+128KHz CLK (5.0V): 2.5256  KHz IO switch
+128KHz CLK (3.3V): 2.5477  KHz IO switch
+128KHz CLK (1.8V): 2.5849  KHz IO switch
+\end{verbatim}
+As voltage drops, IO increases.
+\\
+\textbf{VCC Dropout voltage:}
+From 1.5, it drops out at 1.248V or so. Comes back at about 1.34V
+\\
+Test size of 1.
+\\
+Can't run this with one (AA) battery, but you could with 2.
+\\
+Current Draw: 128KHz - IO test, 1.8V, 0.08mA (~78uA) (tested w/3478A)
+\\
+
+
+
+
+
+\end{document}
+